Greenbrier Companies · OpenAPI Overlay 1.0.0

API Evangelist enhancements for Greenbrier Tank Car Gauge Table API

Records the enhancements API Evangelist applied on top of the derived contract for Greenbrier Tank Car Gauge Table API. The base document itself is left untouched. Provenance: Derived from the provider's own shipped AngularJS client and confirmed by live probe; no Greenbrier-published spec exists.

5 actions 5 updates update extends openapi/greenbrier-cos-gauge-table-api-openapi.yml
Authorship not recorded No authorship marker is recorded for this file. It is not presented as the provider's.
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What the actions change

x-api-evangelist-profilex-api-evangelist-provenancex-first-party-specx-verified-onx-authenticationx-rate-limitsx-support-channelx-status-page

Targets 5

$.info
$
$.paths.*.get
$.paths['/api/car/{mark}/{carNumber}/gauge-table'].get
$.paths['/api/car/{mark}/{start}/-/{end}/valid-car-number-list'].get

OpenAPI Overlay

Raw ↑ 
overlay: 1.0.0
info:
  title: API Evangelist enhancements for Greenbrier Tank Car Gauge Table API
  version: 1.0.0
  description: 'Records the enhancements API Evangelist applied on top of the derived contract for Greenbrier Tank
    Car Gauge Table API. The base document itself is left untouched. Provenance: Derived from the provider''s own
    shipped AngularJS client and confirmed by live probe; no Greenbrier-published spec exists.'
extends: openapi/greenbrier-cos-gauge-table-api-openapi.yml
actions:
- target: $.info
  description: Stamp third-party provenance on the contract.
  update:
    x-api-evangelist-profile: https://apis.io/provider/greenbrier-cos
    x-api-evangelist-provenance: Derived from the provider's own shipped AngularJS client and confirmed by live
      probe; no Greenbrier-published spec exists.
    x-first-party-spec: false
    x-verified-on: '2026-09-12'
- target: $
  description: Record the estate-level facts a consumer needs before calling.
  update:
    x-authentication: none - every catalogued operation answers an anonymous GET
    x-rate-limits: none published, none signalled at runtime
    x-support-channel: https://www.gbrx.com/contact-us/ (corporate contact form; no API support channel exists)
    x-status-page: null
    x-changelog: null
- target: $.paths.*.get
  description: Mark every catalogued operation as safe and repeatable - the public surface is read-only.
  update:
    x-safe: true
    x-idempotent: true
    x-consequence: read-only
- target: $.paths['/api/car/{mark}/{carNumber}/gauge-table'].get
  description: 'Flag the estate''s most dangerous error semantic: an unknown car is answered as HTTP 200 with a
    JSON null body, so a client that branches on the status code reads ''not held'' as success.'
  update:
    x-null-body-on-miss: true
    x-agent-caution: Do not branch on the status code. Parse the body and test for null before use.
- target: $.paths['/api/car/{mark}/{start}/-/{end}/valid-car-number-list'].get
  description: Record the observed unbounded response size so a client bounds the range itself.
  update:
    x-unpaginated: true
    x-observed-max-response: 982 KB / 20,049 records for GBRX 700000-724234, observed 2026-09-12