How do trains work? Especially, how does the electricity flow between the power lines and the train, for example, while changing tracks?

Question

How do trains work? Especially, how does the electricity flow between the power lines and the train, for example, while changing tracks?

In: Technology

Answer 1

The details of the power supply change per country. Most systems use 2 overhead power lines, a single overhead and a return through the rails, or a third rail and return through the normal rails. This can be done with AC or DC.

When a train changes tracks it usually loses power supply for a short while. Batteries can be used to bridge the gap while switching to the new supply. Again, the details change depending on the location