Most shippers think of railroads as a handful of massive carriers, and those Class I railroads do move the bulk of long-haul freight. But between the mainline and your loading dock, there's often a short line doing the unglamorous work of getting cars to and from your facility. This guide lists every Class I railroad operating in 2026, explains what "Class I" actually means, and walks through how short lines differ on pricing, service, and interchange — because how the two work together directly affects your costs and your options.
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What Makes a Railroad "Class I"?
Annual operating revenue. That is the entire test. The Surface Transportation Board (STB) publishes a revenue threshold, indexes it for inflation every year, and any railroad above that line is a Class I. Track miles, locomotive count, geography, and service quality play no part in it.
The threshold has moved a lot. The STB reset the base in 2021 from $250 million (in 1991 dollars) to $900 million (in 2019 dollars) and has restated it upward every year since; for the 2025 reporting year it was $1,094,774,354 — call it $1.1 billion. The dollars change every June, the structure stays put.
| Class | Annual operating revenue (inflation-indexed) | Approximate count in the U.S. |
|---|---|---|
| Class I | Above roughly $1.1 billion | 6 freight carriers |
| Class II (regional) | Between roughly $47 million and the Class I line | Around 20 |
| Class III (short line) | Below roughly $47 million | Roughly 600, including switching and terminal carriers |
So how many Class I railroads are there? Six freight carriers operate in the United States: BNSF Railway, Union Pacific, CSX Transportation, Norfolk Southern, Canadian National, and Canadian Pacific Kansas City. You will see seven quoted, and occasionally eight, for three reasons:
- Amtrak clears the revenue threshold and is technically a Class I, but it hauls no freight, so shipper-facing counts leave it out.
- Ferromex, Mexico's largest railroad, appears in some North American tallies. It is not a U.S. carrier and is not classified by the STB.
- Older references still say seven freight carriers. Canadian Pacific and Kansas City Southern merged into CPKC in April 2023, and much published material has not caught up.
Two of the six, CN and CPKC, are Canadian-headquartered but operate substantial U.S. networks through subsidiaries that file with the STB as Class I carriers; for a shipper the distinction has no practical meaning. The classification also carries regulatory weight: only Class I carriers file the detailed annual cost reports (the Uniform Rail Costing System data) that underpin rate-reasonableness analysis, which is why the industry has public cost data at all.
The Six Class I Railroads, One by One
Here is the practical version — headquarters, footprint, commodity strengths, and what a shipper should know. Route mileage is approximate and shifts year to year as carriers sell branches.
| Railroad | HQ | Route miles | Footprint and gateways | What it means for shippers |
|---|---|---|---|---|
| BNSF Railway | Fort Worth | ~32,500 | Western two-thirds of the U.S.; Pacific ports, Gulf ports, Canadian and Mexican border gateways | Largest network by mileage. Privately held under Berkshire Hathaway and historically willing to spend on capacity when peers were cutting. Dominant western carrier for grain, coal, and industrial products. |
| Union Pacific (UP) | Omaha | ~32,000 | Western U.S., overlapping BNSF across most of its territory; all major western gateways, Gulf ports, and Mexican border crossings | Largest by revenue in most years. Strong in chemicals, petroleum, grain, industrial products, and automotive. Where UP and BNSF both serve a facility you have real leverage; where only one does, the lane is captive. |
| CSX Transportation | Jacksonville | ~20,000 | Eastern U.S.; Atlantic and Gulf ports, connections into eastern Canada | Heavy in coal, aggregates, chemicals, agricultural products, and automotive. CSX and NS divide the East the way UP and BNSF divide the West; eastern competition comes down to whether you can reach both. |
| Norfolk Southern (NS) | Atlanta | ~19,500 | Eastern U.S.; dense coverage of the eastern industrial corridor, Atlantic and Gulf access | Strong in metals, construction materials, chemicals, automotive, and coal. Subject of a pending merger with Union Pacific (see below), so its future footprint is the least settled of the six. |
| Canadian National (CN) | Montreal | ~20,000 | Canada coast to coast, plus a U.S. spine running north–south through the middle of the country to the Gulf; the only Class I touching the Pacific, Atlantic, and Gulf | Strong in grain, forest products, chemicals, petroleum, and metals. The option shippers overlook when they assume the map is "two western railroads and two eastern railroads." |
| Canadian Pacific Kansas City (CPKC) | Calgary | ~20,000 | Canada, the U.S. midcontinent, and Mexico; the only single-line railroad connecting all three countries | Formed April 2023 from CP and KCS. Cross-border moves that once required a handoff at the border can now stay on one carrier. Strong in grain, fertilizer, chemicals, automotive, and cross-border traffic. If you ship to or from Mexico, re-check routing assumptions built before 2023. |
Read the list in pairs. BNSF and UP share the West and are close enough in size that the ranking shifts with the metric. CSX and NS share the East on the same pattern. CN and CPKC run north–south and cross borders: CN is the only one that reaches three coasts, and CPKC the only one that reaches Mexico without an interchange. For a shipper, which carrier is "largest" is irrelevant. Which carrier physically reaches your facility, and whether more than one does, determines your routing options and pricing leverage. Competition on rail is geographic before it is anything else.
Pricing a specific lane? Get an indicative carload rate in 60 seconds — origin, destination, commodity and your email. It is an estimate to plan with, not a rate.
How the Count Fell From Over 100 to Six
There were more than 100 Class I railroads in the 1950s. The collapse to six is the most important context for how rail pricing works today, and it happened in three phases.
- Regulated decline, through the 1970s. Rate regulation left railroads unable to price their way out of trouble while trucking took the high-value freight. Bankruptcies piled up, culminating in the Penn Central failure and the federal creation of Conrail.
- Deregulation and shedding, 1980 onward. The Staggers Rail Act let railroads price commercially, sign confidential contracts, and abandon or sell unprofitable branches. They did all three aggressively, and thousands of miles of branch line went to new independent operators — the origin of most of today's short line industry.
- Merger to the endpoint, 1990s to 2023. The survivors combined into progressively larger systems: BN and Santa Fe into BNSF, UP absorbing Southern Pacific, CSX and NS splitting Conrail between them, CN and CP each expanding into the U.S., and finally CP and KCS forming CPKC in 2023.
The result is a network that is financially healthy and efficient, and also one where a large share of rail-served facilities have exactly one railroad at the door. That is the structural fact behind captive-shipper pricing, the long-running fight over reciprocal switching, and why two shippers moving identical commodities identical distances can see wildly different rates.
What Is a Short Line Railroad?
A short line railroad is a small freight railroad that operates a limited network — often a single branch line or a small cluster of branches — and connects the industries along that network to the national rail system at one or more interchanges with a larger carrier. It handles the first and last miles of a rail move rather than the long haul, and nearly every short line is a Class III railroad (under roughly $47 million in annual revenue). The word "short" refers to the railroad, not your shipment: a short line might move your car 12 miles or 180 miles, then hand it to a Class I that runs it two thousand miles.
Two related terms come up constantly. A regional railroad is bigger — typically a Class II with hundreds of miles of track and genuine line-haul service. A switching or terminal railroad is a Class III that moves cars around a port, an industrial district, or between connecting carriers' yards. The American Short Line and Regional Railroad Association (ASLRRA) covers all of them, which is why "short line" gets used loosely for any railroad that isn't a Class I.
Collectively they are not a rounding error. Roughly 600 short line and regional railroads operate about 29% of U.S. rail route miles — roughly 47,000 miles of track — and originate or terminate one in every four carloads. Some run a few miles serving a single industrial park; others cover several hundred miles and reach multiple Class I interchanges. What they share is a local focus: they know their customers, territory, and commodities in a way a continental system can't replicate.
Why Short Lines Exist in the First Place
The modern short line industry is largely a product of the Staggers Act. Low-density branches that could not justify a Class I cost structure were sold or spun out to independent operators, mostly in the 1980s and 1990s. Both sides usually came out ahead: the Class I shed money-losing track while keeping the long-haul traffic that originated there, and the new short line ran the same track with a lower cost base and a management team whose entire business depended on the customers along it. Track headed for abandonment stayed in service, and the shippers on it kept rail access.
That history explains the personality of the industry. A short line has no diversified national network to fall back on if a customer leaves, so losing one plant can be an existential event. That is why short lines are, as a rule, far more responsive than their larger connections — the incentive structure is simply different.
Ownership varies more than most shippers expect. Some short lines are independent, family-owned operations. Many belong to holding companies — Genesee & Wyoming, Watco, OmniTRAX, Patriot Rail and others — that run portfolios of dozens or hundreds of railroads. A holding-company short line typically brings more capital, better systems, and standardized commercial practices; an independent often brings more flexibility and a shorter path to a decision-maker. Knowing which you are dealing with tells you how to approach the relationship.
One policy piece affects the track your cars ride on: the Section 45G short line tax credit, made permanent in 2020, gives qualifying railroads 40 cents on the dollar for track maintenance, capped at $3,500 per mile. It funds a meaningful share of the rail, tie, and bridge work that keeps these lines viable.
Class II Regional Railroads: The Middle Tier
Between the Class I giants and the Class III short lines sit around 20 Class II regional railroads, earning between roughly $47 million and the Class I threshold and typically operating several hundred to a couple thousand miles of track.
Regionals function as a hybrid: enough scale to run scheduled service, maintain heavier-duty track, and handle significant volumes, but still small enough to offer more personalized service than a Class I. The revenue-only definition produces odd results here — Montana Rail Link ran roughly 900 miles of heavy-duty mainline with through trains for decades and was still a regional by classification, right up until BNSF absorbed it. Other examples include the Florida East Coast Railway and several of the larger Genesee & Wyoming properties.
For shippers, regionals often offer the best of both worlds: real volume capacity, better track than many short lines, and responsiveness to individual customers.
Key Differences Between Short Lines and Class I Railroads
Here's how the two compare across the factors that matter most to shippers:
| Factor | Class I Railroad | Short Line Railroad |
|---|---|---|
| Network size | 19,500–32,500 route miles, coast to coast | Typically 10–500 miles, local |
| Annual revenue | $1.1B+ (billions for the largest) | Under ~$47M (Class III) or $47M to the Class I line (Class II) |
| Primary role | Long-haul mainline transportation | First-mile/last-mile, local switching |
| Train operations | Long unit trains, scheduled manifests | Short local trains, flexible scheduling |
| Track standards | 136-lb rail, high-speed mainlines | Often 90–115-lb rail, lower speeds |
| Car weight limits | 286,000 lb standard on mainlines | Varies — some limited to 263,000 lb |
| Pricing | Publishes the through rate; mostly confidential contracts | Takes a division of the through rate; prices local moves itself |
| Customer access | Through sales reps and pricing desks | Often direct relationship with management |
| Service flexibility | Structured, less negotiable | More willing to accommodate custom needs |
| Technology | Advanced tracking, PTC, automated dispatch | Varies widely — some advanced, some basic |
The biggest practical difference: Class I railroads prioritize their most profitable long-haul lanes and largest customers. Short lines prioritize keeping every customer on their line, because losing even one to trucking dents their revenue. When a shipper says "the railroad has been great to work with," they usually mean a short line; "the railroad won't return my call" usually means a Class I. Both are structural, not personal.
How Short Lines and Class I Railroads Work Together
Short lines and Class I railroads aren't competitors — they're partners in a relay system. The typical flow works like this:
Origination on the short line
A shipper loads a railcar at a facility on the short line's track. The short line picks it up with a local train and moves it to an interchange — a yard or junction where its track connects to the Class I network.
Interchange to the Class I
The car transfers to the Class I and enters the mainline network, joining a manifest train or waiting at a classification yard until a train is built for its destination corridor. Every handoff is a place where cars can dwell — our railroad interchange guide covers what happens at those junctions.
Long-haul movement
The Class I (or several, if the route crosses carrier territories) moves the car across its mainline network. This is where the bulk of the distance gets covered and where rail's cost advantage over truck is earned.
Interchange to the destination short line
At the far end, the Class I delivers the car to another interchange, where a second short line picks it up for final delivery.
Delivery to the receiver
The destination short line moves the car to the receiver's siding for unloading. The empty then reverses the journey or gets repositioned for its next load.
A single shipment can therefore involve two, three, or four railroads. You don't usually coordinate the handoffs yourself — interchange agreements handle that, and the pricing is typically wrapped into a single through rate. The Class I also sets the network's rhythm: when it restructures its operating plan, every shipper on its network feels it, including those who only ever talk to a short line.
How Pricing Works When Multiple Railroads Are Involved
You rarely see a separate short line charge, but how the money moves behind that single number has real consequences. There are three scenarios:
Through-rated moves
The most common arrangement. The Class I publishes a single rate covering the entire origin-to-destination move, including the short line segments at each end. You pay one rate to one railroad (usually the Class I), get one invoice, and the Class I compensates the short line under a revenue-sharing agreement called a "division."
This is the simplest scenario: one rate, one bill, one point of contact. The downside is that the division is negotiated between railroads, not with you. A short line that receives a thin division on a lane has limited room to invest in track, equipment, or service for it no matter how much it wants your business — and that shows up as deferred maintenance, slower switching, or fewer operating days. When a short line says it cannot improve something, the constraint is often revenue it does not control. Your short line's financial health is your service reliability.
Local moves
If your shipment stays entirely on the short line — between two facilities on the same railroad, or from a facility to a nearby transload terminal — the short line publishes its own tariff and you deal with it directly. Local rates are often reasonable because the short line has low overhead and wants to keep your freight off trucks. The transload directory maps active U.S. terminals so you can find nearby handoffs without cold-calling carriers.
Rule 11 moves
Under a Rule 11 arrangement, each railroad rates and bills its own segment instead of participating in a through rate. This can produce a better all-in number and shows what each carrier is actually charging, at the cost of more paperwork. We cover the mechanics in Rule 11 rail rates explained.
Does the short line add cost?
Not as a line item — but short line mileage is not priced like Class I mileage. A short line's division has to cover crew, locomotives, and track maintenance on a route that may see a few trains a week, so its cost per mile is higher. Comparing raw dollars-per-mile across lanes with different carrier structures will mislead you; look at the all-in cost of the complete move.
For what actually drives a rail number — tariffs vs. contracts, fuel surcharge, volume, and where the leverage sits — our guide to rail freight rates covers rate construction in detail. To see a first-pass through-rate estimate for your own lane before any carrier conversation, run a rail freight quote. It is an indicative estimate, not a carrier rate, and we do not guarantee rates.
The Service Advantages of Short Lines
Short lines get overlooked by shippers who assume bigger is better. In reality they offer advantages a Class I structurally cannot match:
Personal relationships
On a Class I, you're one of thousands of customers managed by a continent-wide sales organization. On a short line, you might be one of twenty or thirty, and the general manager knows you by name. When you need an exception, you can call the person who makes the decision. Try that with a Class I pricing desk.
Flexible scheduling
Class I schedules are driven by network optimization; if the scheduled train doesn't fit your loading window, that's your problem. Short lines have more flexibility. Need an extra switch on Thursday for a rush order? Many will accommodate it, especially for a customer who pays on time and turns cars quickly.
Willingness to handle small volumes
If you ship three cars a month, you're not moving the needle on a Class I income statement. But three cars a month might be 10% of a short line's traffic, and you'll be treated accordingly. Many short lines will also store loaded or empty equipment on surplus track at far more forgiving terms than a Class I storage tariff — worth real money for seasonal commodities.
Industrial development support
Short lines actively recruit industry to their line and will help engineer, permit, and sometimes cost-share a new spur or transload site. Their business model depends on adding carload origins, so they have a genuine reason to help you get built — support you rarely get from a Class I unless you're a Fortune 500 account.
Short Line Limitations Shippers Should Know
Short lines aren't perfect. These are constraints to plan around rather than discover mid-shipment:
Track weight restrictions
Many short lines run on older, lighter rail — 90-lb or 100-lb versus the 136-lb Class I standard — and lighter rail means lower weight limits. Some can't handle the standard 286,000-lb loaded railcar and are limited to 263,000 lb, meaning less product per car. A car rejected at interchange for exceeding the limit is an expensive problem.
Speed and capacity
Short line track is often maintained to FRA Class 1 or 2 standards (10–25 mph), and cars often wait at the interchange for the connecting carrier's next pull. A railroad with three locomotives and two crews also cannot absorb a surprise surge. If your pattern is spiky, tell them well in advance.
Limited operating days
Not all short lines operate seven days a week; some run five, some fewer. A car released Friday afternoon may not move until Monday — a planning fact, not a service failure, but one where demurrage can sneak up on you.
Systems, finances, and track condition vary
Some short lines offer car tracking and EDI comparable to a Class I; many still run on phone calls and spreadsheets, which means less visibility on their segment and more manual coordination for you. Financially, they range from well-capitalized holding-company properties to single-line operators on thin margins. Many were sold precisely because they needed capital the previous owner would not spend, and deferred maintenance shows up as slow orders, weight restrictions, and outages. Before committing volume, understand who owns the railroad and how well they maintain it. A small railroad's problems become your problems fast.
Working With a Short Line: What to Ask Up Front
A short line will usually talk to you directly and quickly. Use that access. These questions determine whether a lane works, and they are worth asking before you commit to any volume.
- What is the route rated for? 286,000 pounds is the industry standard; lines that have not completed upgrades may be limited to 263,000, which changes how much product goes in a car and may rule out certain equipment.
- How often do you switch my facility? Daily, three days a week, or on call? This drives your loading plan and your demurrage exposure.
- Which carriers do you interchange with, and where? This determines your routing options and how much competition you actually have on a lane.
- How often do you run to the interchange? A railroad that switches your plant daily but reaches the junction twice a week has a bottleneck downstream of you.
- Are there clearance or seasonal restrictions? Bridge ratings, overhead clearances, and weather-related slow orders all vary and all matter for oversized or heavy loads.
- What are your demurrage and storage terms? These are the short line's own tariffs, often more accommodating than a Class I's — but get them in writing.
- Who do I call when a car is late? On a short line, this is usually a specific person who answers the phone. Get the name.
One more habit pays off: treat the short line as a source of intelligence, not just a service provider. Its people know which interchanges are congested, which Class I lanes are running well, and where cars are actually sitting.
The Pending UP–NS Merger
Union Pacific and Norfolk Southern announced in July 2025 that they had agreed to combine, which would create the first single-line transcontinental railroad in the United States — more than 50,000 route miles across 43 states.
As of September 2026 the transaction is under review at the Surface Transportation Board and is not approved. The Board rejected the first filing as incomplete in January 2026, accepted a revised application in May 2026 while holding the proceeding in abeyance pending supplemental information, and the applicants completed those submissions in late July 2026. The companies say they expect to close in mid-2027 if approved. Current STB merger rules require applicants to show the deal is in the public interest and enhances competition — a stricter standard than governed the 1990s consolidations.
What a shipper should do right now: nothing dramatic. If approved, the Class I freight count drops from six to five, and single-line service would open on lanes that currently require an eastern-to-western interchange. Know which of your interchanges the combination would eliminate, but don't build a plan around an unapproved merger with a 2027 target date. Watch it; do not bet on it.
What This Means for Your Freight Decisions
Whether you're evaluating rail for a new facility or diagnosing your current service, here's the practical takeaway:
Know your railroad
Figure out which railroads serve your facility. If you're on a short line, know which Class I it interchanges with and whether there is more than one option — two Class I connections give you competitive rate options a facility with one railroad at the door will never have. And invest in the short line relationship: the general manager, the trainmaster, and the car clerk determine whether your cars get switched promptly or sit an extra day.
Set Class I expectations correctly
Class I railroads are excellent at moving heavy freight long distances at low cost per ton-mile. They are not built to hold the hand of a shipper moving eight cars a quarter. Commercial teams are organized around large, repeating traffic; most freight moves under confidential contract; railroad-supplied cars go to committed shippers first; and demurrage tariffs are published, enforced, and less forgiving than a short line's. The most common mistake new rail shippers make is assuming a Class I works like a truckload carrier — call, get a rate, book a load. Rail is a capacity-planning business; bring forecast volume and consistent loading behavior.
Factor short lines into your rate analysis
The through rate already includes the short line's compensation. And if a short line offers a local rate that competes with trucking on a short haul, it may be a better deal than you'd expect — short lines price aggressively on local traffic. Our rail vs truck calculator puts the all-in cost side by side for exactly the moves where short lines tend to win.
Use a rail logistics provider
Navigating a multi-carrier network — short lines, Class I railroads, divisions, and interchange agreements — is exactly where a rail logistics provider earns their keep: knowing how divisions work, which interchanges offer the best service, and how to structure rates across carriers.
Class I railroads are the interstate highways; short lines are the local roads. You need both, and the shippers who understand how the pieces fit together get the best service and the best rates. If you're new to rail, our supply chain and logistics courses cover carrier structure, network design, and pricing, and the rail freight glossary is worth bookmarking for carrier conversations.
Frequently Asked Questions
How many Class I railroads are there in 2026?
Six Class I freight railroads operate in the United States in 2026: BNSF Railway, Union Pacific, CSX Transportation, Norfolk Southern, Canadian National, and Canadian Pacific Kansas City. Some counts say seven because Amtrak clears the revenue threshold, but it carries no freight; older lists of seven freight carriers predate the 2023 CP and KCS merger into CPKC. If the pending Union Pacific and Norfolk Southern merger is approved, the count drops to five.
What revenue makes a railroad Class I?
Annual operating revenue above the Surface Transportation Board's inflation-indexed threshold. For the 2025 reporting year the figure was $1,094,774,354, roughly $1.1 billion, and the STB restates it every year. Track miles, locomotive count, and geography play no part in the classification.
What is the difference between a short line and a Class I railroad?
Class I railroads are the six largest freight carriers in North America, each earning more than roughly $1.1 billion a year and running long-haul mainline networks of 19,000 to 32,000 route miles. Short line railroads are small, locally operated carriers, usually Class III with under roughly $47 million in revenue, that handle first-mile and last-mile service on branch lines of 10 to 500 miles. A single move often uses both.
What is a Class III railroad?
A Class III railroad is the smallest revenue class the Surface Transportation Board defines: annual operating revenue below roughly $47 million. Nearly every short line, switching, and terminal railroad in the country is a Class III. Class II regional railroads sit between roughly $47 million and the Class I line, and there are around 20 of them.
How many short line railroads are there in the United States?
There are roughly 600 short line and regional railroads operating in the United States. They operate about 29% of total rail route miles and originate or terminate roughly one in every four carloads moved by rail.
Do shippers deal with the short line or the Class I railroad for pricing?
It depends on the move. For through-rated shipments, the Class I publishes a single rate covering the entire origin-to-destination move and compensates the short line under a revenue-sharing arrangement called a division. For local moves that stay entirely on the short line, the short line publishes its own tariff. Under a Rule 11 arrangement, each carrier rates and bills its own segment separately.
Does a short line add cost to my rate?
Not as a separate line item in most cases. On a through-rated move the short line's compensation is already inside the single rate the Class I publishes, so you see one number and one invoice. Short line mileage does cost more per mile than Class I mileage, because the short line spreads crews, locomotives, and track maintenance across far fewer trains, but that is built into the through rate rather than added on top. The exceptions are local moves priced by the short line and Rule 11 moves where each carrier bills its own segment.
Can a short line railroad handle heavy freight like unit trains?
Some can, some cannot. Many short lines operate on lighter-weight rail (90-lb or 100-lb vs. 136-lb on Class I mainlines), which limits axle loads and train length. Some have upgraded to handle 286,000-lb cars and unit train volumes, but many are limited to 263,000-lb cars and manifest carload service. Confirm weight and length restrictions with the short line before planning high-volume moves.