As well as the components for a number of different types of shell, the Railway companies, under the direction of the Railway War Manufactures Sub-Committee of the Railway Executive Committee, produced mountings for larger artillery, water-tank carts, miners' trucks, heavy-capacity wagons, machinery for howitzer carriages, armoured trains and ambulances. In 1916, when the many factories being constructed by the Ministry of Munitions began producing large volumes of munitions, the work of the Railway Companies in producing war materials actually increased and they continued to produce high volumes of munitions throughout the war. The official record, presented to the Government in May 1920, of the munitions work done throughout the war by the various railway companies ran to a total of 121 pages, giving some idea of the scale of what was undertaken by the Railway Companies across the country. Many of the companies undertook this vital war work to the detriment of the maintenance of their locomotives, carriages and wagons.