@schrottkatze@mastodon.catgirl.cloud
Post #2391043
2025-10-18 09:17 UTC
Replies (3)
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@viq@social.hackerspace.pl 2025-10-18 13:19
@schrottkatze@mastodon.catgirl.cloud @lalonsander@chaos.social I've seen once table or graph with numbers, and trains are still much worse in that respect than bikes.
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@lis@mk.catgirlsfor.science 2025-10-18 13:26
@schrottkatze@mastodon.catgirl.cloud @lalonsander@chaos.social considering a diesel locomotive which uses 6-20 g diesel per t·km; let's assume 10 for simplicity's sake. diesel has an energy density of 43 kJ/g, or about 10 kcal/g. that would work out to 100 kcal/t·km, or 0.1 cal/g·km. so about the same order of magnitude as a human on a bike. possibly even lower. electric locomotives may be even more efficient. that is, if you count energy per total mass moved. a bike typically has less than a quarter of the mass of the human riding it, but a train can weigh many times more than what it's transporting, especially if what it's transporting is humans. for instance, a crowded twindexx carriage might transport something like 250 people. assuming an average human+luggage weighs 100 kg, that's 25 t of payload in a >50 t carriage, plus maybe 75 t of locomotive…
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@DerPumu@mstdn.games 2025-10-18 18:02
@schrottkatze@mastodon.catgirl.cloud @lalonsander@chaos.social they might be near that unmarked yellow dot in the 100kt area