Welcome to Diagram3D

MRC Show London 2019 Diagram3D designs and produces kits for scale model railway vehicles. The kits are produced using innovative techniques and modern technology. The kits are laser cut in card, MDF or wood and can be assembled without soldering. The assembly instructions can be freely downloaded from this website. We don't mind sharing historical information. There is a download section for interesting prototype information which has been collected  from various sources. Our products include historical  notes and pertinent details.

Making models of historical railway vehicles can be frustrating. The prototypes often had complicated panels and details. Reliable historical information can be difficult to find. Producing a set of vehicles from scratch can be a daunting prospect.  Our intention is to reduce this frustration and save your valuable modelling time. Each of our kits will assemble into an accurate body shell which can then be used to produce a detailed model.

The results can be impressive. Visit our gallery for images of completed models and details of construction. Save your time by using our products.

Covid-19/Coronavirus Information:

Orders are being accepted and processed as usual. Post Office deliveries may be delayed by circumstances out of our control. (Updated 11th May 2020)
LNWR Covered Carriage Truck "O" Gauge
LNW706 assembled LNW706 LNWR Covered Carriage Truck components
This kit will enhance any pre-grouping layout. It is a 7mm scale /"O" gauge kit which represents a London & North Western Railway (L&NWR) Covered carriage truck. This vehicle type that was long lived and commonly seen in passenger trains during the pre-grouping era.
The model is primarily made of MDF with card overlays for strapping and roof. Click on any image or here LNW706  to visit the product page.
GWR Siphon O1,O2,O3

This kit is for a GWR milk van, however it would make a pleasant addition to any layout.. It can represent any one of the versions O1,O2 and O3  of this vehicle. (Updated November 2018).

GWR-S02 Siphon O1,O2,O3, 4mm scale

 Click here GWR-S02

or any image to link to the product page.


GW04-S04 Milk Van (O4) exploded assembly diagram



GWR Siphon O4

More kits for GWR modellers, siphon O4 vehicles. There are two kits, one of  which represents the standard vehicle. The other kit represents siphon number 1777 which was uniquely adapted with side louvres, a precursor to later designs, As usual these are bodyline kits. (Updated: November 2018)

Click Here for GW04-S04GWR-S04 Siphon O4, 4mm scale

Click Here for GW04-1777GWR-1777 Siphon O4, 4mm scale