A locomotive power interrogator

This is an electronic device used to indicate and record the activity of a number of switch locomotives in a yard area. This device will interrogate, via the existing radio on board each locomotive, information as to the power status of the locomotive. This information is then automatically transmitted back to the Base Station where it is indicated by a set of colored lamps, recorded on a strip chart recorder and the total time the locomotive is in motion is recorded on a lapsed time clock. The accumulated records from this device can then be used to determine the best utilization of the switching locomotives and their crews.