| ̷ ̷ ̷ ̷| ̷ ̷- noun
Britain : a railway block system in which the signals permitting a train to enter a block are locked while a train is in the block and automatically unlocked as it leaves the block
| ̷ ̷ ̷ ̷| ̷ ̷- noun
Britain : a railway block system in which the signals permitting a train to enter a block are locked while a train is in the block and automatically unlocked as it leaves the block
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012