Class S (Class NB before 1900)
The W.A.G.R.'s first bogie sheep trucks (class NB later class S) were a batch of twelve wagons which entered service in 1893. Like the four-wheeled class C sheep trucks they were double decked. A second batch of 36 followed in 1896 with a final batch in 1897. Similar wagons were build for the M.R.W.A. as their class D from about 1902. No more bogie sheep trucks were built until 1920 when the first of the SA (soon reclassified SX) class was introduced. A total of 20 of this design was built. The next design of bogie sheep truck was the SXT class which consisted of two four-wheeled type bodies mounted on a bogie underframe. Ten of these were built in 1960/1 using bodies of CXB class four wheelers and the frames of TA class cattle wagons. For the final design the SA class designation was used again. This was another batch of 10 vehicles built in 1968.
Other sheep trucks
Four-wheeled sheep trucks can be found in classes C, CA, CX, CXA, and CXB.
Service vans
After the end of livestock traffic by rail the "S" classification became redundant. It the late 1980s it was re-used for service vehicles. I have only a limited idea what the significance of the different classifications is but the at least one of the SB class, was marked as a "SPACER WAGON". The wagon record card has these described as "Service buffer wagons". I have no idea of the function of the SC class which is just described as a "Service wagon". The SD class converted brake van was described as a "pantograph vehicle" and was used in the suburban electrification programme.

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