track circuit
with | polarized relay
| track circuit | |
| transp. el. | circuito de via |
| polarized relay | |
| el. | relé polarizado |
| |||
| circuito de via | |||
|
track circuit : 54 phrases in 5 subjects |
| Communications | 1 |
| Electronics | 4 |
| Information technology | 6 |
| Rail transport | 16 |
| Transport | 27 |