@openstreetmap/id-tagging-schema/data/fields/service_rail.json

The OpenStreetMap tagging model used by the iD editor

{
    "key": "service",
    "type": "combo",
    "label": "Service Type",
    "strings": {
        "options": {
            "spur": "Spur",
            "yard": "Yard",
            "siding": "Siding",
            "crossover": "Crossover"
        }
    },
    "autoSuggestions": false,
    "customValues": false
}