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Discourse exists and is free to self-host and open source. Compared to classic forum software (like most *bb variants) it is a pleasure to use and feels not like a remnant of a lost age.
The (only?) downside is the similar name to Discord, but that’s not them to blame, because they had their name first.
There are use cases for battery trains. In remote, mountainous locations where the cost for electrifying a track is very high it is not uncommon to use electric trains with batteries. Here in Germany we have several regions where diesel trains have been replaced by them.