Block Signalling
Trains cannot collide with each other if they are not permitted to occupy the same section of track at the same time, so railway lines are divided into sections known as blocks. In normal circumstances, only one train is permitted in each block at a time. This principle forms the basis of most railway safety systems.
Read more about this topic: Railway Signalling
Famous quotes containing the word block:
“For Jews demand signs and Greeks desire wisdom, but we proclaim Christ crucified, a stumbling block to Jews and foolishness to Gentiles...”
—Bible: New Testament, 1 Corinthians 1:22-3.