James Thompson Marshall

SECR N class No. 1850 with experimental J. T. Marshall valve gear

James Thompson Marshall (1854, Glanford Brigg, Lincolnshire[1] - 1931, Knaresborough, Yorkshire[2]) was an English railway and mechanical engineer known for inventing the 'Marshall valve gear' for steam locomotive use. James Marshall began his engineering career at the Leeds-based Steam Plough Company, and later moved to the city's Boyne Engine Works.

Marshall valve gear

J. T. Marshall invented and patented several different valve gears but these should not be confused with the "Marshall valve gear" patented by Marshall, Sons & Co. in 1879. At least one of J. T. Marshall's valve gears was a rotary type and the only known application was to the Austrian BBÖ Class 114 locomotive.

The better-known J. T. Marshall gear was a modified Walschaerts valve gear which was first applied to a Great Northern Railway mineral locomotive, no. 743, in 1901[3] and received a glowing report.[4] Next, it was tried on GNR Class C2 No. 1520 in March 1903. There was no external change visible on the locomotive as a result of this modification. When the valve gear was in use, the motion was derived from two eccentrics, one of which gave lap and lead movement by swinging the link backwards and forwards on its suspension bracket. The other eccentric was set at 90 degrees to the crank and rocked the link by means of a bell crank on the hanging link pin. The position of the radius rod die pin in the link determined the direction of movement and the cutoff. Showing little advantage over the normal Stephenson link valve gear, it was removed from the C2 'Atlantic' in April 1907 to ease maintenance.[5]

A modified version of the gear (for outside drive) was tried on SECR N class no. 1850 in 1933-4 but, again, it was not a great success.[6]

Patents

Death

Marshall died in 1931.

References

  1. http://search.findmypast.co.uk/results/world-records/england-and-wales-births-1837-2006?firstname=james%20thompson%20&lastname=marshall&eventyear=1854&eventyear_offset=0&district=glanford%20brigg
  2. http://search.findmypast.co.uk/results/world-records/england-and-wales-deaths-1837-2007?firstname=james%20&lastname=marshall&eventyear=1931&eventyear_offset=0&yearofbirth=1854&yearofbirth_offset=1
  3. "Great Northern Railway locomotives: Bury, Sturrock & Stirling designs". Steamindex.com. Retrieved 12 January 2013.
  4. "Papers Past – Evening Post – 12 April 1902 – A Railway Revolution. NEW DEVELOPMENT IN ECONOMICAL HAULAGE". Paperspast.natlib.govt.nz. 12 April 1902. Retrieved 12 January 2013.
  5. "Brief Biographies of Mechanical Engineers". Steamindex.com. Retrieved 11 January 2013.
  6. "Marshall valve gear". Maunsell.org.uk. 3 February 1934. Archived from the original on 6 February 2012. Retrieved 12 January 2013.
  7. "Espacenet – Bibliographic data". Worldwide.espacenet.com. 19 December 2012. Retrieved 12 January 2013.
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