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Catenary, also knows as electrified track, is first available in approximately 1905. It is depicted as cables strung from trusses across the tracks.
Catenary is necessary for electric locomotives to run. The entire line must be electrified for an electric locomotive to complete its line.
In approximately 1905, catenary will become available for construction from the track construction menu. Catenary can be added or removed from existing rail. When using the add/remove catenary tool, track will highlight green when you can add catenary and red when you can remove catenary. New tracks can be constructed with catenary already included.
Stations cannot be built nor converted with catenary, however once connected to track it will automatically detect any catenary and will automatically become electrified. Depots will do the same.