The Crossing Gate No. 252 would lower the gate and the two RED lights on the top would light up as a train passed by. This was activated from the weight of a train going over a No. 145C Contact that was placed beneath the track. This gate was available from 1950 until 1962, and the only variation (B) has a CREAM colored arm (possibly caused by impurities in the plastic) instead of the WHITE version (Variation A).