A TRS19 and above steam engine spec for the LSWR (later Southern Railway) D15 class 4-4-0 tender engine as rebuilt by Maunsell with larger cylinders, lower boiler pressure and superheating. Boiler pressure: 180psi. Tractive effort: 20100lbs. 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 and my AWG Physics rules on the DLS. Please see the included readme.txt for further information.