Sefflex Railmotor

7mm (O) 1:43.5 and 4mm (OO) 1:76 also 1/4 inch (O) 1:48 and 3.5mm (HO) 1:87

In 1927 a pair of railmotors was ordered from Shefflex Motors Ltd., who operated out of Tinsley in Sheffield. These were delivered to the Selsey Tramways (by then the West Sussex Railway). Shefflex was a manufacturer of lorries and trucks, and their chassis was used as a basis for the units.

for more information

http://www.steamandthings.com/fpage57.htm