Caver Keith said:
Yesterday I uploaded a new video ...
http://youtu.be/iuLKgspvo_c
The image of a smouldering explosives wagon immediately reminded me of a train explosion in the 2nd world war. Your video of the van being detached, averting serious disaster, has a direct historical precedent. I guess you may be well aware of this but am sharing in case it interests others on the forum. More info here:
http://ww2today.com/2-june-1944-two-g-c-s-after-soham-railway-disaster
https://en.wikipedia.org/wiki/Soham_rail_disaster
Incidentally, your mirroring real events is in keeping with the original Awdry books:
"Nearly all of The Railway Series stories were based upon real-life events. As a life-long railway enthusiast, Wilbert Awdry was keen that his stories should be as realistic as possible. The engine characters were almost all based upon real classes of locomotives, and some of the railways themselves were directly based upon real lines in the British Isles."
Source: http://ttte.wikia.com/wiki/The_Railway_Series