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Hydrogen locomotive
(www.money.pl)
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this post was submitted on 17 Sep 2023
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I don't know about Poland but I know about France (I would guess we're not so far appart on this point).
While 95% of railways are electrified, those last 5% are not very worth it to invest in, because really low traffic and hard to operate (eg. in mountains). I've already heard of compromises, like hybrid locomotives that can run on battery for more than half the line and rely on diesel for the remaining.
In Soviet Union Caucasus was electrified first for this exact reason. Without electrification it was too hard to operate.