Am 27.04.2015 um 13:50 schrieb Andrew Moglestue:
Or would the line be down until the proper system can be restored?There are prcoedures, but I haven't studied them all. The most common case is a failure of the on-train equipment. In normally signalled land it is allowed to continue with speed restriction or with a second person in the cab. On ETCS-Level-2-Lines the driver can be allowed to continue at reduced speed, provided radio is still working.
Failures of the lineside equipment will regularly close down operation. Priority is then to bring passenger trains into a station. Some twenty years ago a manual operation with telephone and written orders would have started. Today it would theoretically be possible to do so over radio. But the number of employees doesn't allow such an operation today.
And finally, if the signal boxes are out, will there still be juice in the overhead line? The other way round, if 50-Hz current is off, it is possible to feed signalboxes from the 16.7 Hz overhead line.