Key:railway:interlaced

Denotes that a railway is a Gauntlet track, two or more railway tracks tracks which are interlaced with each other without becoming one physical track.

There are various reasons for this: Narrow row-of-way, structure gauge (e.g. some trains are incompatible with high platforms) and junctions.

Since gauntlet tracks are by far the minority of railway tracks, it's overall assumed that railway:interlaced is no unless denoted otherwise and thus should be left out on most tracks.

How to map

It's important to map interlaced rails as two separate ways first and foremost because both rails are physically separate objects in real life and doing so also doesn't falsify the placement of the railway=switch should they interlace for that reason.

Add railway:interlaced=yes to both tracks until the points of con/divergence (a general rule of thumb is that they're interlaced for as long until the rail of one of the tracks crosses a rail of the other).

For multi-gauge tracks, use gauge=* with semi-colon separated values (e.g. gauge=1000;1435) since both tracks share one rail unless both tracks have their own pair of rails and the narrow track isn't located right in the middle of the wider one.

Examples

Image	Description	Examples
	The narrow overpass isn't wide enough to support trams on their own ROW and cars at the same time (currently not tagged as interlaced).	945776536 945776536 945776537 945776537
	Cotati station with interlaced tracks on platform 2 to allow freight trains to pass easily through while allowing passenger trains to reduce the gap during boarding.	641376400 641376400 641376401 641376401
	Example involving tram-trains: Freight trains drive straight through the station whereas the narrower tramcars near themselves to the platform to reduce gaps during boarding.	311032243 311032243 311032244 311032244 311032245 311032245