{
  "slug": "railway-scale-supports-region-assignments-22ebd06da2f8",
  "title": "railway scale supports region assignments",
  "tools": [
    "railway"
  ],
  "tags": [
    "agent"
  ],
  "introduced_at": "2026-05-07T23:51:28.000Z",
  "announced_at": "2026-05-07T23:51:28.000Z",
  "effective_at": null,
  "date_basis": "source-publication",
  "status": "unknown",
  "how": {
    "incantation": "When setting a service’s replica counts by region, run `railway scale` with at least one `REGION=REPLICAS` assignment. For example, `railway scale eu-west=2 us-east=1` sets two replicas in EU West and one in US East.",
    "examples": [
      "railway scale eu-west=2 us-east=1",
      "railway scale --service <SERVICE> --environment <ENV> eu-west=2 us-east=1"
    ],
    "gotchas": [
      "Version: v4.53.0",
      "REGION=REPLICAS (required): One or more positional assignments: a friendly region name or Railway region ID, followed by a non-negative integer replica count. Maximum 50 total replicas across regions.",
      "-s, --service <SERVICE>: Service to scale; defaults to the linked service.",
      "-e, --environment <ENV>: Environment for the service; defaults to the linked environment.",
      "--json: Output the result in JSON format."
    ]
  },
  "why_it_matters": "When changing a service’s region scaling in Railway, set its region counts from the CLI.",
  "sources": [
    "https://github.com/railwayapp/cli/releases/tag/v4.53.0",
    "https://github.com/railwayapp/cli/pull/881",
    "https://docs.railway.com/cli/scale"
  ],
  "rank": 0.92035,
  "judge": {
    "publish": true,
    "judge_model": "codex-cli/gpt-6-luna+typesafe/jev-1.13.0",
    "prompt_version": "extract-v7+enrich-v2+judge-v2x3+jev-publish-v1"
  },
  "review_state": "approved",
  "provenance": {
    "run_id": "wave1b-20261016",
    "verdict_id": "wave1b-20261016:wave1b-20261016-1886a0217a08fc20-0:gate",
    "evidence_hash": "203c88942f7166913b3c533b1ee4ab4ff6f7581f72382904f79f707ebc7fdce8"
  },
  "review": {
    "draft_hash": "000d020bc51a4499c10dedcf3c5293ec8c8514e6ebae59d4d74f9faf748c5ea8",
    "reviewer": "publication-gate",
    "reviewed_at": "2026-10-07T00:00:00.000Z",
    "decision": "wave1b-20261016:gate",
    "reason": "2 of 3 judge runs approved with p_yes >= 0.9 (mean 0.92 >= 0.9; 2 needed) and Jev gave 0.78 (>= 0.6 needed)."
  }
}