Mapes Crossing Relay Acronyms

XRP - Crossing Relay rePeater
XR - Crossing Relay
LXR - Left Crossing Relay
XSR - Crossing Stick Relay
NTR - North Track Relay
STR - South Track Relay
RXRP - Right Crossing Relay rePeater
LXRP - Left Crossing Relay rePeater
RER - Right Electric-Light Relay
LER - Left Electric-Light Relay
RFLR - Right Flasher Relay
LFLR - Left Flasher Relay
XRR - Crossing Relay Reverse
TSR - Trap Stick Relay [???]
TU - Timing Unit