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3.5mm

3.5mm scale also known as "HO" is exactly half "O". It is the most popular model railway scale in the world. Wikipedia HO SCale

GWR Siphon O1 (four wheeled) kit HO
This kit is based on the original early GWR siphon version O1. This was a four wheeled vehicle and should not be confused with the six wheeled siphon which is also available as a kit  from Diagram3D. This is the HO (3.5 mm scale) version  of this kit. The OO (4mm scale) version of this kit is also available from this website. The orginal vehicle was produced in several lots between 1871 and the late 1880's. There were two distinct variations with differing door profiles.  Sufficient..
£15.00
GWR Siphon O1,O2 and O3 body kit HO
This kit is based on the GWR siphon versions O1 through O3. Sufficient parts are provided to complete one of the versions. This kit represents the two door version of this vehicle. The kit consists of  a MDF base with card overlays. THere are two end profiles with parts for three different end types. This is the HO (3.5 mm scale) version  of this kit. The OO (4mm scale) version of this kit is also available from this website. The principal difference between the versions was the end framing ..
£20.00