68701 ⎘
Arrangements for interlocking between points and signals by means of a single interlocking device, e.g. central control; Interlocking devices having electrical operation with electrical locks Details
SWITCH CONTROL METHOD FOR RAIL TRANSIT SIGNAL SYSTEM, AND APPARATUS FOR METHOD
#2Peripheral control post of railway field devices and installation method of said peripheral post
#3Method for isolation of vital functions in a centralized train control system