Meaning of permissive working | Babel Free
Definitions
A system allowing more than one train at a time to be on the same line in a block section, a signal section, or a dead-end platform line.
UK, uncountable
CEFR level
B2
Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.
This word is part of the CEFR B2 vocabulary — upper intermediate level.