Tag:railway=interlocking
 railway = interlocking
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 |
| Description |
|---|
relation representing the interlocking controlled by a railway signal box 
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| Group: railways |
| Used on these elements |
    |
| Requires |
| Status: undefined |
| Tools for this tag |
The tag railway=interlocking is used to mark interlocking range relations which describe the extent of an interlocking (including stations, signals, level crossings, remote-controlled signal boxes) controlled by a signal box (interlocking tower).
Usage
Tags
| Key | Value | Comment | Presence |
|---|---|---|---|
type
|
railway
|
Defines this relation as a railway relation. | ! Required |
railway
|
interlocking
|
Defines this relation as an interlocking range. | ! Required |
name
|
Interlocking name | The name of the interlocking. | ‽ Important |
railway:ref
|
Interlocking reference | The abbreviation or reference code for the interlocking. | ? Optional |
Members
| Role | Refers to | Object | Comment | Count | |
|---|---|---|---|---|---|
| empty |  
|
railway=signal_box
|
Signal box | The signal box (interlocking tower) controlling this interlocking. | ! 1 |
facility
|
|
railway=facility
|
Operating site | Operating site relations of the sites (stations, yards, junctions, crossovers) which are part of this interlocking. | ! 1+ |
signal_box
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|
railway=interlocking
|
Remote interlocking | Other interlockings (with their relation) remote-controlled by this one. For modern electronic interlockings, this may result in a multi-level set of nested railway=interlocking relations, representing their hierarchy.
|
? 0+ |
crossing
|
|
railway=level_crossing
|
Level crossing | Level crossings which are controlled by this interlocking. Do not include manually operated or fully automatic level crossings here. | ? 0+ |
signal
|
|
railway=signal
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Signal | Signals which are controlled by the interlocking (but not part of an operating site). | ? 0+ |
There is a significant number of relations not complying with the roles defined in this way by the OpenRailwayMap tagging scheme. In some cases, the respective rail tracks 
railway=rail/subway/… of the controlled area are included as members of the relations. In particular in many non-German-speaking countries, where the concept of operating sites may not exist, there often is no railway=facility member, but signals and switches are included individually. The physical extent of the interlocking is then often expressed by including an additional landuse=railway area in the relation.
History
Previously, interlocking relations had been tagged as railway=controlled_area. This tagging was deprecated in favour of interlocking in 2014.