Works Nos. 3031 and 2981. Originally built in 1941 as unmanned powered target trolleys for military use. They have now been converted into two very different locomotives.
“Liz” is a locomotive of conventional lines powered by a Petter single cylinder petrol engine. She sees very little service on the line as it is somewhat underpowered for most trains.
“Sue” is a railbus type machine powered by a Reliant Regal car engine and with four forward gears is capable of quite a turn of speed.