A TRS19 and above steam enginespec for the LNER Gresley Class A1 pacific as modified after comparative trials against a GWR Castle Class locomotive. Boiler pressure: 180psi. Tractive effort: 29835lbs. Braking values set to emulate vacuum brake performance. This spec uses real world data to the maximum extent possible and will perform most accurately if used with appropriate enginespecs (with VB in the title) for British rolling stock. Please see the included readme.txt for further information.