The person who controls whether the light shows red or green and gives verbal authorization is the same. It's both a tool, to transmit the same information.
The person who controls whether the light shows red or green and gives verbal authorization is the same. It's both a tool, to transmit the same information.
Same information, no.
A person saying you have a green light when you have a red light is not the same information at all. The probability that something has gone wrong and will lead to disaster is many many times higher.
That's also true, but you should also be able to trust written movement authorities, otherwise why have them in the first place?
The right move here would've been to accept the suggestion to drive the train, but not accept the suggestion to drive it at normal speed. The driver should have driven at 40km/h.
+1 high speed should only be enabled by multiple redundant safety system being operational. Otherwise, it needs to operate at line of sight speeds.