After looking at the site and on Google maps I saw no sign of the Nimrod fuselage. I believe the carriages had been part of the Chattenden Light Railway/Tramway which served the barracks, and which connected to Upnor and to the Grain line. I believe some of them are now at Kemsley and Sittingbourne Rlwy. There was at least one oddball Aveling loco which was basically a chain-driven traction engine converted for rail use, and this is now in Cahtham Dockyard.