Working rail roads and their tracks.

[WinterDeere]

Why on earth would on stop on tracks behind another vehicle?? Then do you hope n pray a train doesn't come?

Could have been that it was too late to stop ahead of tracks, when light changed and car in front of him stopped unexpectedly. Drivers of cars rarely consider the position into which they're putting any truck in their rear view mirror... if they even ever look at their rear view mirror.