The thing that really makes these stand out from standard highway flashers is the use of a rotating stop sign (banner). When a train approaches the crossing, the lights begin to flash, the bell rings and the stop sign turns to face oncoming traffic. As the train leaves the crossing, the lights and bell stop, and the sign rotates out of view to traffic. These signs originally had overhead lamps to illuminate the crossbuck and stop sign. 

As time went by, many of the signal received some slight modifications. In many cases crossbucks were replaced with more modern sheet metal blades. Original crossbucks were either reflectorized or were the narrow width type, as seen above. Also, stop signs were replaced as the old ones became abused and rusted. Original stop signs on these were usually yellow and in some cases, reflectorized. These signals used a unique egg shaped light housing that was mounted from the bottom of the light fixture. Many early signals did not have background discs. Original light hoods (visors) on these were longer than those found on regular 8 3/8" lights.

Below is a list of links to view photos, diagrams and a list of signals known to be in service, as well as any that are known to be on public display.