Possible Clues:

• Railway next to the main track
• Short track: primitive instinct to stop to perform it?
• An individual track in a marshalling yard
• Track onto which goods trains may be shunted
• Track has one slipping, left abandoned
• Section of rail track used for shunting
• Short track for shunting
• Stretch of railway track used to store rolling stock
• Line that comes to full stop?
• Aligning