|Describes the primary usage of this railway or pipepile|
|Used on these elements|
|Status: in use|
|Tools for this tag|
The distinction between main and branch line in general should be straightforward, but may be vague in certain circumstances; for example, if the branch line is very long. Some generic criteria are described in the table, below, but one should consider each case individually. Often, branch lines are described as such in the official name, however, sometimes rail is named "XYZ Main Line" even though it is more appropriately tagged usage=branch.
The distinction between the other types of usage should be more obvious.
|A track is either tagged with usage=* or with service=*! This rule does not apply for industrial (harbours, mines, large industrial complexes) and military railway infrastructure. These tracks may be tagged with both usage=industrial/usage=military and service=*.|
Inside a railway station area, use usage=* only for the main tracks (not for siding, yard tracks etc.). That also applies for crossover or overtaking tracks outside of the railway stations. Always use usage=* only on the main tracks (apart from the exception mentioned above).