I've just learned a new word - diegetic. Thanks!

Was it obvious in context exactly which things had exploded though - were there other things in danger of going off?

I can imagine sometimes the audio description might get ahead of itself and sort of spoil tension - does that happen?

@sarajw The wagon that exploded was on a train, so perhaps it'll be relevant if we see the same train later on. Without more description I don't know if the train is safe or not, but obviously can't see the visual to know if that was communicated to the rest of the audience.

Description often breaks atmosphere, particularly with jump scares in horror we find. It's necessary much of the time, but I do wish I could have it in my ear rather than mixed into the whole family audio feed that we share.

In that clip you posted - it looks like the gas wagons that exploded may have been on another train, which had just gone over the points of a junction - and was clipped by the speeding train where they're showing the interior with all the panicking people.

Mind you, that's from watching that very short clip several times now - not sure all that context would have been caught visually - depends what came before and after it...