| |||
| self-locking | |||
| block signal locked when automatically returned to danger by train | |||
|
bloccaggio automatico : 3 phrases in 2 subjects |
| Mechanic engineering | 2 |
| Transport | 1 |
| |||
| self-locking | |||
| block signal locked when automatically returned to danger by train | |||
|
bloccaggio automatico : 3 phrases in 2 subjects |
| Mechanic engineering | 2 |
| Transport | 1 |