Thats over 130,000 lengths of Peco flexible track. Apparently its going to take 2 weeks. Seemingly they havnt learnt any lessons from the James May programme.
If they had any sense, they'd get 1000 yards of sl-100, or sl-700 if its still going to be O gauge, (and a few spares, I suppose), then pick it up after the train has passed and shuttle it down to the other end. It'd save track being left out for the Borrowers overnight and reduce power problems.
According to Google, Fort William to Inverness is a matter of 65 miles by the main road. Even thrashed, a model loco would take over 24 hours to cover the distance and, being realistic, there would have to be frequent stops (say every 1000 yards???) for oiling and to allow the motor to cool or even be replaced. I hope they're not going to try and do it non-stop or run it as a race again!
As an aside on the power problem, I'd be inclined to whack 24 volts into the track and feed power to the loco through a support coach which would take the power pickup from the loco wheels and regulate it down to 12v, controlled through a conventional R/C TX/RX and pass it back to the loco motor. Several sets of big lorry batteries should do the trick!
Is that the time?????