Railcar Stenciling Requirements: The Data on a Freight Car Side, Explained

The block of stenciled data on a freight car side looks cryptic, but every line has a job — identifying the car, stating how much it can carry, and recording when it was last serviced. Two layers govern it: a narrow federal floor and a much broader AAR interchange marking system.

Two layers of authority

Federal law ( 49 CFR Part 215, Freight Car Safety Standards) sets a small set of mandatory markings. The rest of the marking system — how capacity and weight data are formatted, the consolidated-stencil layout, character conventions — lives in the AAR's Field Manual and Office Manual of the Interchange Rules, which are proprietary, purchase-only documents. We describe their role but do not reproduce them.

What federal law actually requires

Under 49 CFR § 215.301, the reporting mark, car number, and built date must be stenciled or otherwise displayed in clearly legible characters not less than 7 inches high (built date not less than 1 inch) on each side of the car. Related sections cover special cases — § 215.303 addresses the restricted-car “R” marking, and § 215.305 covers maintenance-of-way (“MW”) equipment lettering.

Reading the data stencils

Beyond the federally required identity lines, several capacity and weight stencils are commonly understood as follows (these are industry conventions governed by AAR standards, not federal definitions):

• LD LMT (Load Limit) — the maximum weight of lading the car may carry.
• LT WT (Light Weight) — the weight of the empty car, shown with the date it was last weighed.
• CAPY (Capacity) — the nominal design capacity; largely legacy, with the actual limit set by LD LMT.

The consolidated stencil: maintenance history

Modern cars carry a consolidated stencil block recording servicing dates — for example COT&S (“Clean, Oil, Test & Stencil,” the air-brake control-valve servicing date) and repack/lubrication dates for the bearings. The content and format of this block are defined by AAR standards (Field Manual), so treat the exact layout and intervals as AAR territory — confirm them against the current manuals rather than from any summary.

Tank cars are different

Tank cars add qualification-date stencils under 49 CFR § 180.515 — the inspection/test date and the next due date. We cover those in detail in Tank Car Marking Regulations.

Sourcing stencils and markings

RailDecals supplies stencils, printed marks, cut-vinyl marks, and the consolidated stencil decal — all built for railcar service. Browse the reporting marks & stencils collection or request a quote.

This article is general educational information, not a compliance certification or legal advice. Regulations are amended over time — confirm binding requirements against 49 CFR Part 215 and the AAR Interchange Rules and your own regulatory counsel before acting.