This resulted in the other five locomotives being built, and the class could circumvent the restricted loading gauge of the Tonbridge to Hastings line, and the lessons learned when building the N1s were applied to the future U1 and V class locomotive designs.
This resulted in the eventual construction of five further N1 locomotives, as the class fell within the restricted loading gauge of the Tonbridge to Hastings line. The lessons learned when building the N1s were eventually applied to the U1 and V class locomotive designs.