Here’s the initial statement from the RAIB https://www.gov.uk/government/news/collision-between-two-passenger-trains-near-elstow - pirc_lover had it about right

One train developed a fault which caused it to stop. The second one, as seen on its dashcam, drove through a red signal (which it should have stopped at) and into the back of the first. They are still investigating why the second one didn’t stop at the signal and whether that might include brake failure, safety system failure, driver error, and/or any other factors.

I think I found it on a random internet list, but thanks for the link. Now I know many more ology words…

Ferroequinologist: one who studies trains

Is that not the profile picture of whoever’s post you were trying to view?

Completely agree, treat them broadly like e-bikes. Limited speed and use only on roads and bike paths, not footpaths.

That said, I see a lot of people riding e-bikes which don’t comply with the existing e-bike speed limits, so perhaps better enforcement is needed as well. There’s definitely a place for these faster e-bikes, but they’re basically e-mopeds and should act like it (roads only, driving licence, number plate, MOT, insurance etc.).