Related Clues:

• Barrier around lair
• Bar or banister
• Complain strongly or part of fence
• Track position
• The Iron Horse road
• The permanent way
• Might the bird complain so bitterly over the sleepers?
• That's the bird that gets under the train
• To get the train back is enough to make one tell 2 down
• How one might complain bitterly at having to train over this, perhaps
• You can't believe the one that gets up here to travel by it
• Train on this and inveigh against it
• The line of a bird
• You can't believe what it's like coming back by train
• Train the bird to go over this