automatic block signaling

railroad communications system

en-US/ˌɑdəˈmædɪk ˈblɑk ˈsɪɡnəlɪŋ/
en-GB/ˌɔːtəˈmætɪk ˈblɒk sɪɡnəlɪŋ/

หมวดหมู่:

railway signalling systemsignalling block system