Aparantly they sold off every vehicle on site a few years ago including that shunter. How reliable this is I do not know.
As for the tunnel to the Jeti the entrance is in the base of the conveyor from the A frame shed. It was always flooded and had pumps running 24/7 and sometimes the Fir brigade pumping it. So with it bwing shut and for so long it will most deffo be flooded.
Do you know if there is any information on the pumping online?