Station blocking between signal boxes in one yard

Child Classifications

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• B61L 21/02 Mechanical locking and release of the route; Repeat locks; Coupling of semaphores IPC+CPC Available in IPC and CPC
• B61L 21/04 Electrical locking and release of the route; Electrical repeat locks IPC+CPC Available in IPC and CPC
• B61L 21/06 Vehicle-on-line indication; Monitoring locking and release of the route +1 CPC IPC+CPC Available in IPC and CPC
• B61L 21/08 Order transmission and reception arrangements for giving or withholding permission IPC+CPC Available in IPC and CPC
• B61L 21/10 Arrangements for trains which are closely following one another IPC+CPC Available in IPC and CPC