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I was on a class 379 the other day sat under the pantograph well. During the journey whist traveling at speed there where two occasions where it sounded like the pantograph dropped (a loud thud was heard coming from the roof above). Is this what I heard? Why and how does this happen?

So I understand many of basic concepts behind signaling such as blocks ect but what I want to know is how is a trains route managed throughout it's journey? How do signallers identify trains and how do they know where to send them? Also how was this done in the age before electronics? And do...