Scammell Scarab 6ton version
Scammell introduced the Mechanical Horse in 1933. It was originaly very basic, with no side doors. Two versions were produced, a 3Ton and a 6 Ton. doors were later added as standard, and the winscreen altered from flat to slanted .
in 1948a new design was produced, the Scarab. This had a number of improvements, and was also produced a 3 ton and 6 ton version.
This is the 6 ton version.
Scale N gauge (1/148)
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more info about Scammell Mechanical Horse
https://en.wikipedia.org/wiki/Scammell_Mechanical_Horse
more 3d printed models from Recreation21 here
http://www.rue-d-etropal.com/3D-printing/3d_printed_designs.htm