Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. LT&SR 37 Class -  The LTSR 37 class was a class of 4-4-2T suburban tank engines built for the London Tilbury and Southend Railway in 1897–98. They were designed by Thomas Whitelegg as a development of the earlier LT&SR 1 Class.
Mean Of Transportation