Light at the End of the Tunnel is the gospel-style finale number from the musical Starlight Express.
The solo lines are taken by Poppa, an old Steam Locomotive, (and Belle the Sleeping Car before she was cut).
The lyrics, by Richard Stilgoe, involve many clever plays on words related to the subject of Railway Travel.
The lyrics include a verse and a chorus which pay respect the father of steam, James Watt.
In early Bochum, the coaches took all of Belle's lines, and the revised version likened to the London re-write.