openapi: 3.2.0
info:
  title: Greenbrier Tank Car Gauge Table Reporting Marks API
  version: '1.0'
  description: Public, unauthenticated JSON API behind the Greenbrier Gauge Table Directory at https://tankcar.gbrx.com/.
  contact:
    name: The Greenbrier Companies
    url: https://www.gbrx.com/contact/
  x-derived-from: The provider's own published AngularJS client (https://tankcar.gbrx.com/b/js/ngapp, saved verbatim at openapi/_original/greenbrier-cos-tankcar-ngapp-client.js) and its view template (https://tankcar.gbrx.com/app/js/ng/views/home.view.html, saved at openapi/_original/greenbrier-cos-tankcar-home-view.html), with every route, parameter and enum confirmed by live anonymous HTTP request on 2026-09-12.
  x-derived-on: '2026-09-12'
  x-api-evangelist-note: Third-party profile. Greenbrier publishes no OpenAPI for this service. Every path, parameter, enum and response field below was read from the provider's own shipped client code and then confirmed against a live response — nothing is invented. Write methods do not exist on this surface; it is read-only.
servers:
- url: https://tankcar.gbrx.com
  description: Greenbrier Gauge Table Directory
tags:
- name: Reporting Marks
  description: The railcar reporting marks for which Greenbrier holds gauge tables.
paths:
  /api/car/marks:
    get:
      operationId: listReportingMarks
      summary: List reporting marks
      description: Retrieve every railcar reporting mark for which Greenbrier serves a gauge table. Verified live at 144 marks on 2026-09-12, including GBRX, GATX, UTLX, NATX, ACFX, SHPX and TILX-era Greenbrier-built fleets.
      tags:
      - Reporting Marks
      responses:
        '200':
          description: An array of reporting marks, ordered alphabetically.
          content:
            application/json:
              schema:
                type: array
                items:
                  type: string
                  description: A railcar reporting mark (AAR alphabetic code).
                examples:
                - - ACFX
                  - GATX
                  - GBRX
                  - NATX
                  - UTLX