 |
| |||
| block signal interlocking; interlocking with the block system | |||
| collegamento di blocco: 6 phrases in 3 subjects |
| Communications | 3 |
| Rail transport | 1 |
| Transport | 2 |
|
| |||
| block signal interlocking; interlocking with the block system | |||
| collegamento di blocco: 6 phrases in 3 subjects |
| Communications | 3 |
| Rail transport | 1 |
| Transport | 2 |