A railroad siding is a section of track connected to the main line at both ends, built so trains can pull off and let other traffic by, or so a business can have railcars delivered right to its door. Sidings come in two flavors: passing sidings that keep mainline trains moving past each other on single-track routes, and industrial sidings that give a private facility its own rail connection. If you’re looking at a siding for a business, the commitment goes well beyond laying track. You’ll sign a formal agreement with the railroad, pay the construction cost yourself, carry specific insurance that standard policies don’t include, and take on federal maintenance and inspection duties that don’t ever let up.
What Counts as a Siding
The defining feature is the two-end connection to the main line through mechanical switches, also called turnouts. That’s what separates a siding from a spur, which dead-ends. Turnouts are described by “frog number,” which controls how sharply the track diverges and therefore how fast a train can move through the switch. Numbers 10 and 11 are common on sidings; a rough rule is that doubling the frog number gives the maximum safe speed in miles per hour, so a No. 10 turnout allows roughly 20 mph.
Rail on sidings is lighter than on the main line. BNSF Railway’s industrial track guidelines set a minimum rail section of 112 pounds per yard for customer-maintained trackage and recommend 115 pounds or heavier for new construction.1BNSF Railway. Guidelines for Industry Track Projects Ballast runs at least 6 inches under wood ties, about 8 inches under concrete.
The Federal Railroad Administration regulates all of it under 49 CFR Part 213, the Track Safety Standards.2eCFR. 49 CFR Part 213 – Track Safety Standards Most sidings sit in Class 1 or Class 2 territory, capping freight speeds at 10 and 25 mph. A siding can also be designated “excepted track” if speed stays at or under 10 mph, no passengers ride, and no more than five placarded hazardous material cars sit on it at a time.3eCFR. 49 CFR 213.4 – Excepted Track Excepted track still gets inspected, but structural standards relax a bit.
Why a Business Would Want One
An industrial siding brings the railroad to your loading dock. Grain elevators, chemical plants, refineries, and manufacturers with their own siding can have railcars spotted at the facility, loaded or unloaded on the company’s own schedule, and picked up when ready. That cuts out the cost and friction of trucking bulk freight to and from a distant terminal.
Sidings also function as temporary storage. Railcars parked on your track aren’t tying up space in a classification yard or costing you warehouse square footage. A business with seasonal swings can stage loaded or empty cars on its own siding and smooth out supply chain timing. That buffer is particularly useful in agriculture, energy, and chemicals, where shipment volumes move in sharp waves and there isn’t warehouse capacity for the raw material.
When Transloading Makes More Sense Than a Siding
Not every operation justifies a private siding. A transload facility gives rail access to shippers without their own track by transferring freight between railcars and trucks at a shared terminal. The simplest form is a team track, a basic siding or spur open to public use where the shipper supplies loading equipment and labor. Full-service transloaders add warehousing, packaging, consolidation, and scheduled truck delivery.
The trade-off is clean. A private siding takes significant capital and ongoing maintenance, but you control the schedule and skip the per-shipment handling fee. A transload facility costs nothing to build and nothing to maintain, but every shipment picks up a truck leg and sits inside the terminal’s schedule and fee structure. High, steady rail volume usually makes a siding pay. Irregular or lighter volume usually points to transloading.
The Siding Agreement
The legal relationship between a railroad and a private siding owner lives in a siding agreement, sometimes called a sidetrack agreement. The document spells out who owns what, who maintains what, and who pays for what. You sign one before any track gets built.
Ownership and Who Pays to Build
Ownership typically splits at the property line. The railroad keeps the turnout off the main line and any track on its own right-of-way; the business owns the track on its land.4Norfolk Southern. Siding Agreement Construction cost falls on the private business. Total price depends on length, terrain, drainage, and local labor, but ranges from roughly $200,000 for a short, straightforward connection to well over $1 million for longer or more complicated installations.
Maintenance, With Real Teeth
The private owner has to keep its portion of the track in compliance with federal safety standards, entirely at its own expense. The Norfolk Southern standard agreement puts it plainly: the industry must maintain its segment “in good condition and repair and free from all debris.” If the railroad decides the track is unsafe, it can suspend operations immediately and without notice. For non-safety problems, the railroad can discontinue service after 30 days’ written notice to cure.4Norfolk Southern. Siding Agreement Deferred maintenance can shut off your rail service, and with it, your supply chain.
Indemnity
Siding agreements contain broad indemnity provisions that push liability for accidents, injuries, and environmental contamination on the private track onto the business. That clause is the reason the insurance requirements below matter so much.
Insurance, and the Endorsement Most Policies Miss
Railroads require siding owners to carry commercial general liability insurance as a condition of the agreement. Norfolk Southern’s standard agreement sets a combined single limit of at least $2 million per occurrence.4Norfolk Southern. Siding Agreement Other railroads set higher floors depending on commodities handled and traffic volume.
Here’s the detail that catches owners by surprise: a standard commercial general liability policy will not automatically cover the indemnification language in a siding agreement. You need a specific endorsement, CG 24 17, titled “Contractual Liability – Railroads.” It modifies the policy’s definition of “insured contract” to explicitly include sidetrack agreements.5Independent Insurance Agents of Texas. Contractual Liability – Railroads CG 24 17 10 01 Without it, your insurer can deny a claim arising from the contractual indemnity you signed up for. Finding out after a loss is an expensive way to learn.
Railroad Protective Liability insurance is a separate product that sometimes gets confused with siding coverage. RPL is typically required for construction projects near railroad property, not for ongoing siding operations, with typical limits of $2 million or $5 million per occurrence depending on project scope. If your railroad requires RPL on top of CGL, it will be spelled out in the agreement.
Recurring Charges You Won’t See on Day One
Owning the track doesn’t make moving cars across it free. Two recurring charges catch new siding owners off guard.
Demurrage
Demurrage is the daily charge for holding a railcar past the allowed free time for loading or unloading. The industry once ran on a 48-hour standard, with 24 hours for loading common for decades.6Federal Register. Policy Statement on Demurrage and Accessorial Rules and Charges That single federal standard is gone. Individual railroads set their own free time, and some have cut it to zero credit days for certain car types.
Once free time runs out, the meter is fast. Union Pacific’s 2026 tariff charges $240 per car per day for railroad-owned equipment at a serving area and $145 per car per day at a private industry siding. Refrigerated cars run $280 to $390 per day, hazardous materials cars run $170 to $280 per day, and toxic inhalation hazard cars carry a $3,300 per car per day charge at a serving yard.7Union Pacific. Accessorial Charges A few bad loading days can stack up fast.
Switching Fees
Railroads also charge per-car fees to shuffle cars between the main line and your siding. Norfolk Southern’s published tariff lists intra-plant switching at $175 per car for standard equipment and general intra-terminal switching at $750 per car.8Norfolk Southern. NS 8001-A Switching and Absorption Tariff Hazardous materials carry a surcharge of $131 to $700 per car depending on classification. Cars with more than four axles are charged at double the standard rate. These come straight from the railroad’s tariff and generally aren’t negotiable.
Inspection Duties You Can’t Delegate Away
Owning a siding is an ongoing federal compliance job. The FRA requires visual inspection of sidings at least weekly, with no fewer than three calendar days between inspections.9eCFR. 49 CFR 213.233 – Track Safety Standards – Visual Track Inspections If the siding sees use less than once a week, inspection before each use satisfies the rule. Each siding must also be physically traversed on foot or by vehicle at least once a month.
Switches and turnouts run on their own clock. Every switch, turnout, and track crossing has to be inspected on foot at least monthly.2eCFR. 49 CFR Part 213 – Track Safety Standards Inspectors check for chipped or worn switch points and damaged frogs. A frog point worn more than five-eighths of an inch down and six inches back triggers a mandatory 10 mph speed restriction. Any deviation from the standards means remedial action starts immediately.
Inspections must be done by a designated qualified person, and records must document which tracks were traversed by vehicle and which on foot.9eCFR. 49 CFR 213.233 – Track Safety Standards – Visual Track Inspections Weak recordkeeping is one of the fastest routes to an FRA enforcement action, and the paperwork load is heavier than most owners expect.
If You Handle Hazardous Materials
Facilities that handle hazmat on their siding pick up a separate layer of federal obligations. Any spill or release at or above a reportable quantity has to be reported to the National Response Center at (800) 424-8802.10U.S. Environmental Protection Agency. When Are You Required to Report an Oil Spill and Hazardous Substance Release For oil, the trigger is any discharge creating a visible sheen on navigable water or adjoining shorelines. For hazardous substances, the trigger is release at or above the Superfund Reportable Quantity. Extremely hazardous substances also require notice to state and local emergency planning authorities under the Emergency Planning and Community Right-to-Know Act.
Shipping or receiving bulk quantities of certain hazmat, especially anything toxic by inhalation, requires a written transportation security plan.11eCFR. 49 CFR Part 172 Subpart I – Safety and Security Plans It must cover personnel screening for employees handling covered materials, unauthorized access prevention, and en route security. The plan has to be reviewed annually, updated as needed, and kept available for DOT or DHS inspection. Private sidings sit outside the rail carrier’s own route analysis requirements under 49 CFR 172.820, so the security burden for what happens on your track lands on you.
Can the Railroad Just Stop Serving You?
Not easily. Railroads operate under a federal common carrier obligation to provide service on reasonable request, and they cannot refuse just because serving a particular siding is inconvenient or unprofitable.12Office of the Law Revision Counsel. 49 USC 11101 – Transportation by Rail Carriers The duty isn’t absolute. The request must be reasonable, and existing contract commitments come first. But a railroad can’t simply decide to walk away.13Federal Register. Common Carrier Obligation of Railroads
To stop serving a line it owns, the railroad has to file an abandonment application with the Surface Transportation Board. The application must explain why the railroad wants to abandon, describe track condition, provide service and traffic data and financial projections, and assess the community impact.14Office of the Law Revision Counsel. 49 USC 10903 – Filing and Procedure for Application to Abandon or Discontinue Affected state governors, station postings, newspaper notices, and significant shippers from the prior 12 months all have to be notified. Interested parties then get 45 days to file comments or protests, and offers to subsidize continued operation or buy the line are due within 120 days of filing or 10 days after the application is granted, whichever comes first.15eCFR. 49 CFR 1152.22 – Contents of Application If your business depends on rail access, those procedural rights are the window to fight, negotiate, or buy time before service ends.