 The prototype was rebuilt to the same specification as the 1930 batch, creating a robust workhorse capable of a good turn of speed when working heavy passenger and freight trains.The revised valve gear layout was subsequently applied to the 3-cylinder U1 and V class designs.The relatively early withdrawal of the N1s pre-dated the era of preservationists buying withdrawn locomotives from scrap dealers or British Railways, and consequently no examples of the N1 class survived into preservation.