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Every railroad grade crossing within the radius is returned, joined to its FRA accident history. Supply either this or a state. Coordinates are decimal degrees (WGS84); 0,0 is rejected because it is the NTAD unlocatable sentinel." }, "radiusMiles": { "title": "Default search radius (miles)", "minimum": 1, "maximum": 25, "type": "integer", "description": "Radius used for any site that does not carry its own radiusMiles. Capped at 25 miles. Left unset, the actor uses 1 mile and records search_radius_source on every row so the value is never silently applied." }, "state": { "title": "State (geography mode)", "type": "string", "description": "Two-letter code such as CO, or the full FRA state name such as COLORADO. Lists every crossing in that state instead of screening coordinates. 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