ETA: on the move nearly 45 minutes after scheduled departure time. The last they could have done is handed out bottled water, let alone arrange acceptance on buses or trams. Utter, utter disasterclass.
I was on a TGV a few months ago which encountered 'vandalism' en route and presumably was no longer safe for use on the high speed lines. Thankfully we had stopped right before the junction off onto the high speed line and to Marseille St Charles terminus, and thankfully there is a depot right there, so we diverted into the station for the leading unit to be replaced. Water was handed out about 10 minutes after detraining and the whole thing only delayed us by just under 2 hours despite the heat (it is usually 25-30°C here in the summer). I was actually very impressed by SNCF's response here, they're not exactly known for amazing disruption handling. Yes, I appreciate the proximity of the depot helped but my point here is, stuff like giving out water is the bare minimum.
Though I will say, the reliability of the local services in this region is atrocious - it seems that despite heat being a regular thing, the units do not cope. In the UK I would argue we have a different, larger problem with the temperature and rail conditions being so varied (instead of just warm or hot like my South France example) - it's not like our railway is particularly reliable in the autumn & colder weather either...