For a long time, the few things that could easily move around heavy machinery was trains. So lets say that there’s a train on a track, and its broken down and it either needs repairs, extra parts, or a replacement engine. Right behind it are several other trains, because this is a busy line.
How does a train bringing repair or extra engines deal with this? Its not like they can go right up to the broken down train because there’s other trains in the way. How do they get rid of the broken engine and the other carriages, because they’re on top of the tracks, and there’s no other tracks for them to move onto.
In: Engineering
The Öresunds bridge between Denmark and Sweden has a 100 meter gap without electrical over head wires. This is because Denmark and Sweden uses very different voltages for powering trains. The locomotives has two sets of transformers with automatic selection, so the drivers doesnt have to do anything but coast the 100 meters powerless on the middle of the bridge.
Theoretically there could be a case where a train ends up standing still powerless in the gap. For this reason, copenhagen has kept an old diesel powerd railbound snowmover who is also strong enough to go out on the bridge and pull a train 100 meters till it gets power. Its never been tested though.
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