block signal

The track warrant section is protected by automatic block signals as well.

A player may also "wiggle" or "flash" one block signal to indicate which opponent to serve to.

Ahead, the engine swallowed the bright green lights of the block signals and left a wake of red.

Later, waiting at a block signal, an attendant opened a door.

Instead, they are wired like separate block signals or Distant signals.

In non-interlocking stations, there may be a block signal instead of a starting signal.

The last block signal before the home signal is number one.

This signal is known as a No. 0 block signal.

The block signals let the engineers and train conductor know the position of the trains on the system.

A block signal can show any of the following three aspects: