Something I could try and shed some light on...
I live in the last house towards Clay Mills from the Burton direction. The unit (170101) has stopped just past the end of the garden and I can hear it in the background as I'm typing this now (it has since moved off under its own power).
The car (black Vauxhall Insignia) was, according to the BTP officer who was on the train, not on the crossing but on the track, abandoned, which made sense as Clay Mills is a CCTV crossing. Where it got onto the track I can only assume is the small car park next to the crossing, behind some trees for a playing field. The rest of the length from there to my fence is a lake. The only other option would be for it to drive off the crossing and down the line.
The train was on the down line, with the car coming to rest on the up (corresponding goods lines either side). My brother who was in, heard a screech of brakes but because of where the freights stop, we've got used to it over the 15 years we've been here.
According to the BTP officer who knocked on our door (while I was out having a nosey), a few people got injured on the train, the front is a bit of a mess, and there is one person in custody.
Not the best picture but all I could get on my phone.
(hope it's okay to post this here btw)