relay interlocking

railway interlocking that uses relays

en-US/ˈɹiˌleɪ ˈɪntɚˌlɑkɪŋ/
en-GB/ɹɪˈleɪ ˌɪntəˈlɒkɪŋ/

ক্যাটাগরি:

signalling control