The company has said it will continue to operate normally and to honour all outstanding tickets.

And the system doesn't affect things such as the air conditioning or music, which continue to operate normally.

What fuel there was went to panzer divisions, and even then they were not able to operate normally.

In the event that the computer that controls the trains fails to operate normally, in-cab signalling can be used as a backup.

Its electric field instrument failed circa 2002 but otherwise continued to operate normally.