A rail embargo is a railroad's formal, temporary order to stop accepting certain traffic to, from or through a location because of a physical or operational problem: a washed-out bridge, a derailment, a flood, or a yard or customer facility too congested to take more cars. If your car is covered by an embargo, it will not move unless the railroad grants a permit. This guide covers what embargoes are, the rules railroads must follow when issuing them, how to find out if your lane is affected, and how to get a permit number onto your billing so your car does not sit.
What Is a Rail Embargo?
A rail embargo is a notice from a railroad that it will temporarily refuse to accept specified traffic (by station, customer, commodity, gateway or car weight) because of an actual or threatened impairment that makes service impractical. The industry definition comes from AAR Circular TD-1: an embargo is "a method of controlling Traffic movements when, in the judgment of the serving railroad, an actual or threatened Physical or Operational Impairment, of a temporary nature, warrants restrictions against such movements."
Three words in that definition matter most to a shipper:
- Temporary. An embargo is not a permanent service change. Permanent restrictions belong somewhere else (see the OPSL Note section below).
- Impairment. There has to be a real physical or operational problem behind it. A commercial reason alone does not qualify.
- Serving railroad. The railroad that has the problem issues the embargo. Shippers and receivers cannot issue one.
"Traffic" in TD-1 means loaded cars and revenue empties, including trailers and containers. In a disaster, or when a government order or protest blocks access to a facility, it can cover all rail equipment, railroad-owned and private. Empty private cars can also be embargoed when a single customer is congested and the car owner has not given alternate empty disposition under AAR Circular OT-57.
Every embargo is filed electronically in the AAR Embargo/OPSL Notes and Permit System, which Railinc runs for the Association of American Railroads. Each one lists the affected stations (by Freight Station Accounting Code), the commodities (by STCC, or "all commodities"), any specific customers (by CIF number), the cause, and any exceptions. The AAR sends the notices to every member railroad's embargo officer, to the Surface Transportation Board, and to the American Short Line and Regional Railroad Association.
Why Railroads Issue Embargoes
Railroads issue embargoes when they physically cannot handle traffic, or cannot handle it safely, at a location. The common causes fall into two groups:
Physical impairments
- Bridge fires, washouts, and track or bridge damage
- Derailments that block a line
- Floods and rising water, and approaching hurricanes
- Facilities closed by a government order, or made inaccessible by labor or civil action
Operational impairments
- Yard or terminal congestion
- A customer facility that has more cars on hand than it can unload, so cars back up onto the railroad
- Temporary weight or clearance limits pending a permanent restriction
The congestion embargo is the one shippers run into most, and the one that causes the most friction. When a receiver falls behind, cars pile up in the serving yard. The railroad may embargo that consignee so no new cars are accepted until the backlog clears. If you ship to that receiver, your car is stopped even though your own operation did nothing wrong. Embargoes are a frequent cause of the "why is my car not moving" call. Our guide to why rail shipments get delayed covers the other common causes.
The Rules: What Railroads Can and Cannot Embargo
AAR Circular TD-1 lists specific things a railroad may not use an embargo for. The circular itself says it does not decide whether a given embargo is lawful, and the railroad placing it is responsible for complying with the law. But the list is the industry's own rulebook, and it is the first thing to check when an embargo looks wrong. Under TD-1, Section I.B, embargoes may not be issued:
- As a permanent measure to control traffic
- At the request of a consignee
- As a commercial measure to steer traffic to or via a particular gateway, railroad or destination when the routing has nothing to do with the impairment
- Against accepting traffic on specified days
- To limit the amount of traffic accepted daily or periodically
- Against traffic consigned to the U.S. Government, unless the impairment prevents the movement
- Against a shipper or receiver for failing to pay freight charges or demurrage
- To enforce a contract or an interchange agreement between railroads
- To de-market traffic
- To restrict business growth
- By specific car initial and number
TD-1 also bars a railroad from keeping an embargo in place against a line or station being abandoned, except as a stopgap until pricing documents are revised, and against traffic for weight or clearance reasons, except as a temporary step until the restriction is published as an OPSL Note.
Item 7 is worth remembering. A railroad cannot embargo you because you owe it money. Unpaid demurrage is a billing dispute with its own process. Our rail demurrage guide explains how those charges work and how to contest them.
When an Embargo Takes Effect and What Happens to Cars Already Loaded
A standard embargo takes effect at 11:59 p.m. on the date stated in the notice, and that date cannot be earlier than the date it was submitted to the AAR system. After that, the origin railroad stops accepting traffic to or through the embargoed location, with one important grace period.
If you see an embargo coming against a receiver, the practical move is to finish loading what you can and get those cars billed and released inside the window. Cars you load after the effective date need a permit.
"Effective immediately" embargoes
Some embargoes skip the grace period. TD-1 allows an embargo to be effective immediately only for:
- A security alert
- A facility closed by a local, state or federal government order
- A sudden physical impairment that makes service impossible or highly impracticable, such as a bridge fire, accident, natural disaster, or labor or civil action that blocks access
- An imminent physical impairment, such as an approaching hurricane or rising floodwater
An effective-immediately embargo may not be issued for congestion or any other operational impairment. If a congestion embargo showed up with no lead time, that is a TD-1 issue worth raising with the railroad.
Expiration and cancellation
An embargo stays in effect until it is cancelled, but it expires automatically one year after its effective date unless the railroad asks the AAR to re-issue it. TD-1 says railroads will cancel an embargo as soon as the cause is removed, and amendments that loosen restrictions take effect immediately once submitted and reviewed by the AAR administrator. Amendments that tighten restrictions must follow the same effective-date rules as a new embargo.
Embargo vs. OPSL Note
An embargo is a temporary restriction. An OPSL Note (Open & Prepaid Station List Note) is a permanent or long-term restriction on a station, usually for weight, clearance or capacity. Both live in the same AAR system and both can use permits, but they work differently.
| Embargo | OPSL Note | |
|---|---|---|
| Purpose | Temporary physical or operational impairment | Permanent or long-term operational limit (clearance, weight, capacity) |
| Duration | Expires one year after effective date unless re-issued | Stays in effect until cancelled |
| Effective | 11:59 p.m. on the stated date, or immediately in emergencies | Always effective immediately |
| 48-hour grace for loaded cars | Yes (standard embargoes) | No |
| Can be used for congestion | Yes | No |
| Permit system | Optional, stated in the embargo | Optional, stated in the note |
The Railinc FAQ makes the point directly: re-issuing an embargo every year "should not be considered a long-term solution," and an OPSL Note may be more appropriate. If the same embargo on your receiver has been re-issued for years, the restriction is effectively permanent, and you should plan your routing around it, or ask the railroad whether the underlying problem will ever be fixed.
How to Find Out If Your Shipment Is Embargoed
The fastest way to check is the public search in the AAR Embargo System at embargo.railinc.com. Union Pacific notes that searching is open to the public. You can search by railroad, location and other criteria and read the full notice, including the cause, the commodities and whether permits are available.
To be told when something changes, register for a Railinc user ID and subscribe. Subscribers get an email each time an embargo is created, approved, amended, cancelled or expired. Subscriptions last one year, and Railinc sends a reminder a week before yours lapses. If you ship on a regular lane, subscribe for your origins, your receivers and the interchange points on your route.
Two more places to watch:
- Your railroad's customer portal. Class I railroads post service alerts and embargo notices for their customers. Your account manager can tell you which notices apply to your traffic.
- Waybill rejections. If you bill a car to an embargoed location without a permit, Railinc rejects the billing and the origin railroad puts the car on an embargo hold. If you see an embargo hold on a car, check the system before you call the railroad.
Embargoes can also be placed on interchange points, so a car with a clean origin and destination can still be stopped in the middle of its route. Railinc lets embargo officers set an embargo to stop any waybill whose route passes through a named interchange. If you are not sure how your car changes hands between carriers, our railroad interchange guide walks through it.
How to Get an Embargo Permit
An embargo permit is the railroad's written authorization to move a specific shipment despite an embargo. Not every embargo allows permits. When one does, the notice includes the contact for the party that issues them. Permits are issued to the embargoed party, and either the shipper can request one or the railroad can request one on its behalf.
- Read the embargo notice. Note the embargo number, the cause, the commodities covered and whether a permit system is in place. If it says no permits, a permit request will not work. Look at a different route or destination instead.
- Request the permit from the railroad named in the notice. On Union Pacific, for example, you open a case in UP's Case Management system and choose "Embargo Permits" as the case reason. Other railroads use their own portals or the permit contact listed on the embargo.
- Expect a quota. The railroad's permit officer controls how many permits will be granted and can set a daily allowance. Once the day's limit is used, additional waybills are rejected with a "Permit Limit for the day reached" message.
- Put both numbers on the billing. TD-1, Section IV.C requires the shipper to furnish the embargo number and the permit number. On EDI 404 bills of lading, the embargo number goes in the N9 segment with the EN qualifier and the permit number with the EB qualifier. On UP, shippers who do not bill by EDI enter both numbers in Waybill Management before the car is pulled.
- One permit per waybill, one use per permit. A permit applies to one waybill, regardless of how many cars are on it. Once it is tied to a waybill, it cannot be reused for another shipment.
- Get a permit for every embargo on the route. If a waybill hits more than one embargo, it passes only if it carries a permit for each one.
Missing either number means the shipment is held or the billing is rejected. The most common failure is not the permit request but the bill of lading: the permit was granted, and nobody at the loading dock put it on the waybill. If your billing goes through several hands, make permit numbers a required field. Our explainer on how a rail waybill works covers where the reference fields live.
Unit trains
An embargo can include a "Max Car Allowed" setting. A unit train with that number of cars or fewer can move to the embargoed destination without a permit, and a train with more cars is subject to the embargo. Check this field before assuming a unit train needs a permit.
Illustrative Example: A Car Caught by an Embargo
Illustrative example. The plant, timing and car counts are made up. The rules applied are from AAR Circular TD-1 and the Railinc FAQ cited below.
A resin producer ships covered hoppers to a compounder. On a Tuesday, the serving railroad issues an embargo against the compounder for congestion, effective 11:59 p.m. Thursday, with permits available from the railroad's embargo desk.
- Four cars loaded Monday and Tuesday. They are loaded before the effective date. Bill and release them, and the origin railroad accepts them for up to 48 hours after the effective date.
- Two cars being loaded Thursday. They are in the process of loading before the embargo takes effect, so they also qualify for the grace window.
- Three empties on their way to the plant. They do not qualify. Once loaded, each waybill needs a permit, and the railroad may cap how many permits it grants per day.
The producer subscribes to the embargo, requests permits, and talks with the compounder about how many cars it can actually unload per day. That conversation matters most. A congestion embargo lifts when the receiver catches up, and sending cars faster than the receiver can unload them just restarts the problem. Meanwhile, every car the producer holds back is a car sitting at its own plant or in storage. See what railcar storage costs before deciding where to park them.
When an Embargo Goes On Too Long
An embargo is a temporary excuse from a railroad's common carrier obligation. Under 49 U.S.C. § 11101(a), a rail carrier must provide transportation on reasonable request. The STB and its predecessor have long treated a reasonable embargo as excusing service while the impairment lasts, with the carrier expected to restore service within a reasonable time. Shippers can bring a complaint to the Board when they believe an embargo is unreasonable or is being used to avoid service.
The Board has also looked at embargo practices across a whole railroad. In 2022 it held an oversight hearing on Union Pacific's embargoes (Docket EP 772). In closing that proceeding on April 17, 2024, the STB said UP had used "more than 1,000 embargoes" in 2022, "nearly ten times as many embargoes as any other railroad," and that UP's 2023 embargoes "still exceeded the number issued by all other Class I railroads combined." The Board said it would keep monitoring and expected UP to keep reducing its use of embargoes.
Before you file anything with the Board, work through the practical steps:
- Read the notice and compare it against the TD-1 prohibitions above. An embargo issued to limit daily volume, or to steer your traffic to a different gateway, is a rules problem.
- Check the issue date and amendment history. A congestion embargo that has been re-issued again and again is a long-term restriction in all but name.
- Ask your railroad account manager what has to happen for the embargo to lift, and get the answer in writing.
- Price an alternative: another serving railroad if the receiver has one, a transload, or a different route through a different interchange.
That last step is where a rail logistics provider earns its keep. We track embargoes and car holds on our clients' lanes, get permits requested and onto the billing, and line up alternatives when a destination stays closed. See our rail logistics services, or our managed rail service for exception management on every car. To learn how railroads plan and control traffic in more depth, start with our free Working with Railroads course module.
Sources: Association of American Railroads, Circular No. TD-1 (Code of Car Service Rules/Code of Car Hire Rules: Embargoes/OPSL Notes), revised July 2025, via railinc.com; Railinc, "AAR Embargo System FAQs," last updated September 2025; Union Pacific, "AAR Embargo System" shipping resource page, up.com, accessed October 24, 2026; Surface Transportation Board, news release of April 17, 2024, Docket No. EP 772, Oversight Hearing Pertaining to Union Pacific Railroad Company's Embargoes; 49 U.S.C. § 11101(a). The worked example is illustrative. This is general information, not legal advice. Your contract, the embargo notice and the governing tariffs control.
Frequently Asked Questions
What is a rail embargo?
A rail embargo is a railroad's temporary order to stop accepting specified traffic to, from or through a location because of a physical or operational impairment, such as a washout, derailment, flood or congestion. It is filed in the AAR Embargo System and covers the stations, commodities and customers listed in the notice.
How long does a rail embargo last?
An embargo stays in effect until the railroad cancels it, but under AAR Circular TD-1 it expires automatically one year after its effective date unless the railroad asks the AAR to re-issue it. Railroads are supposed to cancel an embargo as soon as its cause is removed.
How do I get a permit to ship to an embargoed location?
Read the embargo notice to confirm permits are available, then request one from the railroad that issued it. Union Pacific, for example, takes requests through a Case Management case with the reason Embargo Permits. Put both the embargo number and the permit number on your bill of lading, or the billing is rejected and the car is held.
Can I ship cars I already loaded before an embargo took effect?
Usually, yes. Under TD-1, an origin railroad accepts loaded cars to an embargoed location for up to 48 hours after the effective date, if they were loaded or being loaded before it took effect. Empties still on their way to your plant do not qualify, and the grace period does not apply to effective-immediately embargoes.
Can a railroad embargo a customer for unpaid demurrage?
No. AAR Circular TD-1 prohibits embargoes against a shipper or receiver for failure to pay freight charges or demurrage. It also bars embargoes used to limit daily volume, steer routing for commercial reasons, de-market traffic or restrict business growth.