The model is OO Gauge, DCC Ready, has a 21 pin connector fitted, is compatible with the HM7000 system and is suitable for a minimum radius of 438mm. Gresley developed a three-cylinder 4-6-0 to cope with increased loadings on the LNER’s East Anglian passenger services in the shape of the B17 Class, as he could not use his famous ‘Pacifics’ due to weight constraints.