For those interested the Springwell Bank Foot engine shed still exists, tucked in a housing estate, similar age to Tanfields Marley Hill shed but the actual footprint is older. A few other relics survive, rope haulage doesn't however. Worth an explore if any of you are in the area, some canny hills to stomp over with plenty to see if you know what you are looking at. NRM's working replica Rocket was built at Bowes, Locomotion No1 was built at ICI Billingham I think? Only cost £25.