A very, very rare sight. Two WWI vintage protected Simplex locomotives in operational condition. Powered by 7 litre, 4-cylinder petrol engines yielding 40hp. Leighton-Buzzard Light Railway "Twin Turtles Day", May 2004. I was fortunate to obtain ticket #001 for the event. #3090 was fully restored by the "Salvage Squad" TV programme crew in the UK.