Knowledge of wayside/crossing detection and control and other signal-related apparatuses preferred (Example: ABS, CTC, Search Light and Color Light Signals, Hot Box Detectors, Interlockers and AEI Readers, GCP3000+, MS4000, XP4, PMD-3, GCP4000/5000). Inspect, test, and maintain batteries and signal equipment to ensure proper operation of signals and signal equipment such as grade-crossing warning devices, power switches, and switch air unit controllers.