A block section is a stretch of line only one train may occupy. Clear the block section.
The whole of railway safety rests on it, since two trains cannot then be in the same place. A block section is shorter where trains are frequent, which is how capacity is bought.
1nounblock sectionA stretch of line only one train may occupy.
“The block section ran from the junction to the tunnel mouth.”
block section is a section.
Practised in Railways