[Dalberg-Acton]

"The dispatcher could have sent that train into a head-on collision."

I don't think that is possible, or at least it's extremely unlikely by using the signal system. Even if the dispatcher tried to line the signals, there are fail safes in the field to ensure that can't happen.

That being said, train crews can pass red signals under instructions from a dispatcher.

[Publius]

You could be right, but Zoo Interlock is one of the most complicated interlocks in the country.