What railway semaphore is made of
A signal that allows or forbids movement.
- Signal post — has part. A post.
- Semaphore arm — has part. The position of the arm is the signal.
- Signal wire — has part. A cable from the control post.
- Railway signal lamp — has part. A night signal.
- Lever — uses. The semaphore is set by a lever.
- Wood — is made of. The semaphore arm is wooden.
- Cast iron — is made of. On a cast-iron mast.