Transtube
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This page should be merged.
It should be relocated at Transtube because per PROSE: Gallifrey: A Rough Guide.
Talk about it here or check the revision history for additional comments.
The rail was a transport system on Gallifrey in at least one universe. It connected the city of Olyesti and the other Three Minute Cities to the Time Lord Capitol. (PROSE: The Infinity Doctors)
Behind the scenes
According to Steve Lyons and Chris Howarth's Guide to Gallifrey in Doctor Who Magazine #297, the rail system mentioned in The Infinity Doctors is the Transtube seen in The Ancestor Cell.