A TRS2019 and above steam engine spec for the single chimney version of the BR Standard Class 4 4-6-0 tender engine fitted with a double chimney. Boiler pressure: 225psi. Tractive effort: 25515lbs. 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.