Over 300 Class 37 Locomotives were built by English Electric between 1960-1965 and allocated to all regions of British Rail, with the exception of the Southern. With so many operating for over 50 years, it is no surprise that to give a true representation of this fantastic machine, RailSimulator.com has released a selection of Class 37s depicting modifications found later on in their lifetime. Five variants of differing design are included in this add-on.