For understanding why the train moved in the reverse direction, you will have to look at the video carefully. Usually the crossings for getting into the loop line and then getting out of the loop line are at a distance, ie the train gets into the loop line, stops, and then proceeds further for getting out of the loop line. However, in this case the crossings for getting into the loop line and then getting out of the loop line are almost at the same point. So after getting into the loop line the train has to reverse so that the loco is back at the crossing for getting into the main line. Once the loco reaches that point, it stops and then proceeds further to get back into the main line. I hope I have clarified your query.
It...
more... is an interesting crossing, and probably will be there only till the time when the doubling of the route is completed.