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}}80079 is a BR Standard Class 4 2-6-4T tank engine designed by R.A. Riddles. The Class 4 tank engine was derived from the ex-LMS Fairburn 2-6-4T, and was used mainly on commuter and outer suburban services. A total of 155 were built, of which 15 have survived into preservation. While  ==Class 4 tanks in service on the Severn Valley==Class 4 tanks’ route availability was rated as ‘Blue’, with the Severn Valley branch classified as ‘dotted blue’ from [[Bewdley]] to [[BR 3MT 82045|Standard Class 3 2-6-2TBuildwas]] was a common sight Severn Valley line in the 1960s.<ref>[ http://www.michaelclemensrailways.co.uk/?atk=634 ‘Locomotive Route Availability’, route availability restrictions would Michael Clemens’ Railways] (Retrieved 30 March 2017)</ref> This should have restricted the their speed to 25mph, and so limited their use. Several Class 4 tanks were allocated to 25mph[[Kidderminster Shed]] until withdrawal in 1965.<ref>[http://www.brdatabase.info/locoqry.php?action=class&type=S&id=726401&page=fleet 82000 page, BRDatabase] (Retrieved 30 March 2017)</ref> In addition, a few were allocated to [[Shrewsbury]] from mid-1962 onwards, having been displaced from the London, Tilbury and Southend line by electrification. They remained until the end of passenger working, especially north of [[Bridgnorth]].<ref> D.J. Smith, limiting The Severn Valley Railway (1968)</ref> There is little photographic evidence of their use. However classmate on the Severn Valley, with 80072 was photographed on the line on several three occasions during the winter of 1962-63and 80078 at Bridgnorth in 1963 working from Shrewsbury.<ref> SVR News No. 15</ref> It appears they featured much less regularly than the BR Standard 3MT 82000 tanks and LMR Ivatt 2MT 41000 tanks also in use from Shrewsbury at that time.