track-circuit
| permissive-block
| track circuit | |
| transp. el. | sporstrømkreds; skinnestrømkreds |
| permissive block | |
| commun. transp. | permissiv blok |
| |||
| sporstrømkreds; skinnestrømkreds | |||
|
track-circuit : 45 phrases in 4 subjects |
| Communications | 1 |
| Electronics | 4 |
| Information technology | 4 |
| Transport | 36 |