LNER push and pull coaches
Rolling stock converted or built for push & pull operation had been inherited from the NER, GCR and GER. The GCR had built some special purpose vehicles at about the same time as steam railcars were introduced. Push & pull (autocar) working in the North Eastern Area all but ceased by being displaced by Sentinel or Clayton steam railcars, but as these were withdrawn in the late 1930s push & pull services were restored. The GCR had used a mechanical system and this was used on the Wrexham to Seacombe service introduced by the LNER in 1933, but was replaced by the standard LNER vacuum system in 1936/7. The NER had introduced autocar working in 1905/6 using a W. Worsdell patented system, but this was replaced by a vacuum system, and eventually by the standard LNER system. The GER used a compressed air system. The LNER extended this system to services in the Norwich area. The GNR section was very late to use p&p services. The Scottish service was limited to that between Craigendoran and Arrochar.
Webb LNWR Coal engine (0-6-0) No. 920. R.J. Essery (caption). 131.
from the british rail website