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HW 411 leaving the SVR
|years2 = 1985
|events2 = GW 150 main line appearance
|years3 = 2021|events3 = Left the SVR
}}Between the mid-1980s and 2021 the SVR was home to three ex-London Underground 20 ton steel Ballast Hopper Wagons. The design of these originated with the 1902 GWR Diagram P6 20 ton Ballast Hopper<ref>[http://paulbartlett.zenfolio.com/gwrherring Paul Bartlett]</ref> and later 1945 GWR/BR Diagram P22 Ballast Hopper. These were not given a telegraphic code by the GWR, but were given the type name 'Herring' by BR. The London Underground examples include 'foldback' buffers to allow use with L.T. electric loco stock.
| HW 410 || 1938 || GRCW || [http://www.ws.rhrp.org.uk/ws/WagonInfo.asp?Ref=7469 Link] || Left in June 2021
|-
| HW 411 || 1938 || GRCW || [http://www.ws.rhrp.org.uk/ws/WagonInfo.asp?Ref=7472 Link] || Left in August 2021
|-
| HW 436 || 1965 || BR Shildon || [http://www.ws.rhrp.org.uk/ws/WagonInfo.asp?Ref=7468 Link] || Left in June 2021
|}
==Service==
In 1985, 410 and 436 appeared on the main line when they were used used in the [[The Severn Valley Railway on the main line#SVR Wagons used on the main line in preservation| GW 150 demonstration freight train]] which ran to Newport behind [[2857|GWR freight loco 2857]].<ref>SVR News 78</ref>
The wagons saw regular use on Permanent Way duties on the railway until superseded by other larger ballast hoppers, including a 24 ton [[BR 'Dogfish' Ballast Hopper Wagons|BR 'Dogfish' Ballast Hopper Wagon]] and six 40 ton [[BR 'Seacow' 40t Bogie Ballast Hoppers| BR 'Seacow' 40t Ballast Hoppers]]. On 8 May 2021 they were moved to the [[Stourport Triangle]]. Two of the wagons, HW 410 and HW 436 were relocated to the Mid Hants Railway in late June 2020<ref>[https://www.national-preservation.com/threads/rolling-stock-movements.7891/page-25#post-2673322 Mid Hants Instagram via National Preservation Forum] (Retrieved 30 June 2021)</ref>. [[Clayton Class 17 Bo-Bo D8568|D8568]] moved HW 411 to Kidderminster on 19 August for onward travel to its new home.
