Mars light

The Mars Light are signal-safety lights used in the United States and built by Mars Signal Light Company for railroad locomotives and firefighting apparatus.
Mars Lights used a variety of means to cause the light to oscillate vertically, horizontally, or both, to catch the attention of motorists and pedestrians.
Mars lights were developed by Jerry Kennelly, a Chicago firefighter who realized that oscillating lamps would benefit fire departments and railroads. He performed an operational test with the C&NW railroad in 1936, and Mars Lights began appearing on locomotives in the 1930s.
==Trivia==
*Steam engines sometimes have Mars Light.
Category:Locomotive Parts
Category:Encyclopedic articles