A loop line is a track that leaves the main line and rejoins it. Wait in the loop line.
It lets a slow train stand aside while a fast one passes, which is how a single line carries any traffic at all. A loop line has to be long enough to hold the longest train that will use it.
1nounloop lineA track that leaves the main line and rejoins it.
“The freight sat in the loop line for twenty minutes.”
loop line is a track.
Practised in Railways