|pressure = 225 lb/sq in
}}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.
==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 [[Buildwas]].<ref>[http://www.michaelclemensrailways.co.uk/?atk=634 ‘Locomotive Route Availability’, Michael Clemens’ Railways] (Retrieved 30 March 2017)</ref> This restricted their speed to 25mph, and so limited their use.
===Class 4 tanks allocated to Shrewsbury (89A) to September 1963===
Several Class 4 tanks were allocated to [[Shrewsbury|Shrewsbury 89A]] from mid-1962 onwards, including a few displaced from the London, Tilbury and Southend line by electrification.<ref>[http://www.brdatabase.info/locoqry.php?action=class&id=726401&type=S&page=alloc 80000 page, BRDatabase] (Retrieved 23 April 2017)</ref>
{| class="wikitable sortable mw-collapsible"
! Locomotive !! data-sort-type="date" | Dates !! Notes
|-
| 80078 || data-sort-value="21/07/1962" | July 1962 to February 1963 || Locomotive preserved
|-
| 80096 || data-sort-value="21/07/1962" | July 1962 to November 1962 ||
|-
| 80100 || data-sort-value="21/07/1962" | July 1962 to July 1965 || Locomotive preserved
|-
| 80101 || data-sort-value="21/07/1962" | July 1962 to September 1962 ||
|-
| 80135 || data-sort-value="21/07/1962" | July 1962 to February 1963 || Locomotive preserved
|-
| 80136 || data-sort-value="21/07/1962" | July 1962 to February 1963 || Locomotive preserved and has visited the SVR in preservation
|-
| 80098 || data-sort-value="8/09/1962" | September 1962 to November 1962 || Locomotive preserved and has visited the SVR in preservation
|-
| 80105 || data-sort-value="8/09/1962" | September 1962 to October 1962 || Locomotive preserved
|-
| 80131 || data-sort-value="8/09/1962" | September 1962 to February 1963 ||
|-
| 80070 || data-sort-value="15/12/1962" | December 1962 to February 1963 ||
|-
| 80102 || data-sort-value="15/12/1962" | December 1962 to June 1964 ||
|-
| 80132 || data-sort-value="15/12/1962" | December 1962 to February 1963 ||
|-
| 80070 || data-sort-value="09/03/1963" | March 1963 to May 1965 ||
|-
|}
They remained until the end of passenger working, especially north of [[Bridgnorth]].<ref>[[Bibliography#Books|D.J. Smith (1968)]]</ref><ref name="Mag97">[[Bibliography#Books|Magner (1997)]]</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.
===Photographs of use in service on the Severn Valley===
There is little photographic evidence of their use on the Severn Valley, with the following identified:
*80070 on the daily Shrewsbury to Kidderminster pick-up freight at [[Northwood Halt|Northwood]] on 29 May 1963.<ref>Bewdley Station waiting room</ref>
*[[BR Riddles 4MT 80072|80072]] was photographed on the line on three occasions during the very cold winter of 1962-63 (whilst allocated to Swansea East Dock, 87D). This locomotive is preserved and has visited the SVR in preservation.
*80078 at Bridgnorth in 1963 working from Shrewsbury<ref> SVR News No. 15</ref>
*80102 on the last day of service in September 1963<ref name="Mag97" />.
==80079 in service==
*[[Steam Locomotives visiting the SVR for galas]]
*[[Steam Locomotives hired by the SVR]]
*[[Locomotives used on the Severn Valley Branch in commercial service]] for a description of the Class's use on the Severn Valley branch
==References==
