Class 44
The British Rail Class 44 or Sulzer Type 4 diesel locomotives were built by British Railways' Derby Works between 1959 and 1960. They were named after British mountains, and consequently nicknamed Peaks.

In part inspired by LMS prototypes 10000 and 10001, and by Southern Railway 1020110203, the Class 44 diesels were some of the first big diesels commissioned for the British Rail modernisation project and were the precursors to the Class 45 and Class 46 locomotives of similar design.