It was left for a number of years where it got stuck presumably, and was dismantled in 1923. The photo is off a modelmakers website! Sshh!
As for the half track idea being sold to the Czar, you may be right I dont know, Iv only just discovered this odd side of the world of HMV's! But from what I can gather there was a lot of touting going on around this. Post WW1 everyone being a bit paranoid, Russian Revolution, franco Prussian war?