There has been a high level of debate over No 2's true identity, as traditionally locomotives took their numbers from their frames which would make the surviving loco NSR no. 72. As 'New L' class all had superheated boilers, the fact the engine survives with a saturated boiler takes the discussion much further as to whether it can even be classed as a NSR locomotive."The Industrial Railways of Bolton, Bury and the Manchester Coalfield Part 2: The Manchester Coalfield" by C.H.A.Townley, C.A.Appleton, F.D.Smith & J.A.Peden
