D7672 Tamworth Castle is about to plunge into the three mile long Standedge Tunnel at Marsden with the Pathfinder Tours 1Z38 Swindon to Hellifield 'Sulzer Salute' railtour on 16 February 1991. Ten Mk 1 coaches is quite a load for a Class 25, but this didn't seem to present any problems on the day, just plenty of noise! Note the Huddersfield Canal just behind the loco, which also burrows under the Pennines at this point. Standedge Railway Tunnel is the third longest in this country, after the Severn and Totley tunnels.