Leeds loco under a mountain

Picture the scene: I’d driven half way across Europe for a trip or two on a narrow gauge railway operating steam trains on normal scheduled services.  As the train pulled away from a small halt, I spied a collection of NG railway equipment parked under an opened-sided shed.  A visit the next day revealed a Greenbat operating a tour into a “Steinkohl” mine.  It was an interesting tour on the railway underground – the Erlebniswelt Rabensteiner Stollen