In 1936, class leader N 110 was again selected to test new features, this time a series of design changes for improved drafting and reduced cylinder back pressure referred to as 'Modified Front End' which had already been successfully applied to the C class locomotive. N 110's performance was dramatically improved, and all the original thirty N class locomotives were similarly equipped. The most visible change resulting from these enhancements was that their original cast iron funnels were replaced by a less ornate "flowerpot" funnel. They also saw other improvements during this period, such as the fitting of cross-compound air compressors and smoke deflectors.