 Groups existed in Greater London, Manchester, Liverpool/Merseyside, Northern Ireland and the Midlands at one time or another but latterly, there was just one, the "Mainland Area Group".It was this group that were responsible for the building of two wagons for the railway.The "M" class of wagon numbered nearly 80 and were part of the Isle of Man Railway's stock of goods vehicles; by the time of nationalisation of the line in 1978 when the Isle of Man Government took responsibility, there were very few examples left in existence; one (numbered M.70) had been left to rot for many years and was resident in a siding at Santon station for many years.