This code list is used in association with the Service attribute which is present within the Transport Link Feature Type. It indicates additional detail about the type of railway service line that a Transport Link represents. Only populated with 'siding' or Null.
yard
Tracks within marshalling or maintenance yards which are operated by the railway company.
siding
Relatively short lengths of track which run parallel to the main track and are connected to it. These tracks are used by slower trains to be overtaken or to let passengers enter/leave the train if the main tracks do not have platforms.
spur
Relatively short lengths of track connecting a company or entity (e.g. a factory or power plant) to the main railway network.
crossover
Short lengths of track which switch traffic from one parallel line to another. Found only on double or more tracked railways.