Keep railroad lights and signs lit and signaling properly.
Installs third rails on electric elevated or subway railway tracks: Treats wooden insulator blocks by soaking for specified time in hot paraffin. Assembles trolley chairs by forcing top and bottom castings onto wooden insulator blocks with compressed-air press, drilling bolt holes through castings and blocks with power drill, and driving rivets into holes, using rivet gun. Paints anchor blocks with preservative to protect against rot. Installs trolley chairs beneath third rail at ends of rail sections by boring holes through tie and bottom castings and screwing trolley chairs to tie. Installs anchor blocks at center of third-rail sections, bolting block to rail and tie. Arc welds copper bands at junction of rails to provide unbroken electrical connections between rail sections [WELDER, ARC]. Fastens and positions annunciator rails to third-rail at specified points so contact will be made with third-rail shoe of passing trains. May specialize in installation and maintenance of conduit systems for electric street railways and be designated Conduit Installer.