
A railroad crossing advance warning sign on a rural road next to some farmland.

Old concrete whistle sign on approach to a railroad crossing in a forested area.

Railroad crossing advance warning sign at a rural railroad crossing.

Rural railroad crossing with the advance warning sign clearly visible.

A wooden crossbuck protecting a rural railroad crossing.

A whistle sign just before a crossing.

Dual crossing warning light block on its own.

Wooden crossbuck block on its own

Iron crossbuck block on its own.

Railroad Crossing Advance Warning Sign from Railroad Blocks.

Old style concrete whistle sign.

Modern Whistle Sign.

The 4 flags used for signaling on the railroad. Typically, green means proceed, yellow means prepare to stop, red means stop, and blue is used to mark equipment out-of-service or undergoing maintenance (and absolutely not to be moved).