http://www.salisburyjournal.co.uk/news/salisbury/salisburynews/4642153.Train_crash_near_Salisbury/The black Fiat Bravo was travelling south when it appears to have gone out of control and hit a garden wall on the right-hand side of the road.
The car was thrown back across the carriageway, mounted the kerb and went over the embankment onto the track, where it was hit
If you look up the A338 at Broken Cross Bridge on an aerial view, and bear that description in mind, it's pretty clear that this is a total cockup by the driver.
He'll probably try the 'sudden blow out' excuse, which appears a fairly common tactic when boy racers go over kerbs 'broadside on' as far as I can see...
Paul