Very good idea, made ridiculous by the daft attempts to stop the train.
I watched this on TV last night, as it progressed, the overacting, domestic scenarios and ridiculous attempts to catch and stop a very heavy train travelling at high speed with one or two locomotives and the generally wonky direction made me want to leave it. But I found out that, thankfully, it was fairly short, so I watched it until the end. It could have been so much better.
Completely outclassed in every way by 'Runaway Train'.
'The Fugitive' and 'The password is courage.' !!! Have far better train crash sequences! In my opinion.