this post was submitted on 13 Aug 2024
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You’d think with current battery tech we wouldn’t need the overhead wire anymore.
Batteries are heavy and expensive. A wired power source is so much more efficient for rail it’s barely worth discussing.
And have a much shorter lifespan than catenary wire or third rail.
The best use of a battery on a train is a small one to handle junctions. You disconnect from the wire at the end of one set, go through the junction, and then reconnect at the other side. Saves a lot of ugly spaghetti wiring.
Otherwise, no, just use wires.
You don't even need that. Every electric train I know of has pickups on each car, and any break in the catenary or third rail is short enough that it can be bridged naturally by two cars, or sometimes even just one, if it has pickups at both ends.
Some electric trolleys aren't long enough to do that.
That would mean that instead of an engine, you're lugging around a battery pack, which is just as heavy while giving you a fraction of the range of an engine. Not to forget that battery cells have only a finite lifespan.
Meanwhile, OHLE gives you infinite range and room for major weight savings. Plus you can keep running the same power system for decades.
Battery and hydrogen-powered trains exist, they're mainly used on less frequented lines because it would be more expensive to electrify them.