Possible Clues:

• Seems I would be to sing about it, but it will get me nowhere
• For the train, I'd something to sing about
• Not the main line
• Taking one part in an argument on the spare railway track
• Clapboards, e.g.
• It may be aluminum
• Give a bit of music about what I'd be on line for
• Line taken by partisans?
• Short railway branch
• Small branch I had found in grass