BR 4 wheel railbus
Waggon und Maschinenbau
22 delivered in 1958 from five manufacturers (5 Waggon und Maschinenbau from Germany, the rest British). They were planned to have "extensive trials".
Although they were more economical to run, the branch lines they operated on were all closed, an there was no suitable work for them, and all withdrawn in 1960s before TOPS codes issued .
4 of the Waggon und Maschinenbau railbuses are preserved
Requires chassis wheels and finishing
O scale (1/43.5 7mm/ft)
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more info about railbus on BR
https://en.wikipedia.org/wiki/Waggon-_und_Maschinenbau_GmbH_Donauw%C3%B6rth_railbus
more 3d printed models from Recreation21 here
http://www.rue-d-etropal.com/3D-printing/3d_printed_designs.htm