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What is a policy?

Policies attach to resources and bind members to roles, with optional conditions. 
{
  "bindings": [
    { "role": "roles/inventory.equipmentAdmin", "members": ["group:cedxadmins"] },
    {
      "role": "roles/inventory.equipmentViewer",
      "members": ["user:nancy@cedx.rail", "user:steven@cedx.rail"],
      "condition": {
        "description": "Only can view BNSF cars",
        "expression": "resource.equipmentInitial == 'BNSF'"
      }
    }
  ]
}
IAM policy

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Roles

  • Predefined roles (examples):
    • roles/inventory.equipmentViewer
    • roles/inventory.equipmentAdmin
    • roles/inventory.equipmentOrderer
  • Custom roles: create a role with the exact permissions your org needs

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Inheritance

Grant at an organization/site/operator level → inherited by terminals, groups/tracks, and resources beneath. Grant at a terminal/group/track or a specific resource for fine‑grained control.