Signals
Our site was located next to a pair of signals, so we always knew which track a train was approaching on (even though we could see them from miles away). They are approach-lit (only light if there is a train in the block before them) and when one lites the other displays an advance approach indication (flashing yellow), presumably to confirm that it is working.
If anyone has better information on why it would flash yellow when there is nothing in the block I'd be interested to know!
This photo taken on railroad property with permission.
Signals
Our site was located next to a pair of signals, so we always knew which track a train was approaching on (even though we could see them from miles away). They are approach-lit (only light if there is a train in the block before them) and when one lites the other displays an advance approach indication (flashing yellow), presumably to confirm that it is working.
If anyone has better information on why it would flash yellow when there is nothing in the block I'd be interested to know!
This photo taken on railroad property with permission.