Railroad
A railroad was a type of road that served as a traffic system for railway vehicles such as trains, trams or cable cars. They were in use in underground subways as well as on the surface, through cities, towns, and countrysides. ()

In an alternate 2263, a monorail ran throughout Starbase Yorktown, which, along with the public transporters, was a major transportation system in that facility. ()

The Doctor often sang the song known as "I've Been Working on the Railroad". ()

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Infrastructure