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.
GN04-D281 GNR six wheeled brake carriage

GNR D281 third class brakeGreat Northern Railway (GNR) Diagram 281 (D281) Third Class Brake:

This vehicle was an ubiquitous vehicle produced by the GNR.. Approximately 370 of this type were included in the stock inventories at the beginning of the 20th century.

Click on the image or here to see the product details:GN04-D281

Click here to see this model in our gallery: Gallery GN04-D281Similar vehicles were used by the East Coast Joint Stock (ECJS).

One of These coaches, number 589,  has been preserved at the Keighley Worth Railway.GNR D281 third class brake

GN04-D129 45ft Composite Coach

 GN04-D129 45 foot Composite Coach This 45 foot coach built to diagram 129 (D129) was one of several similar vehicles which were designed by Howlden for the GNR in the 1890’s..

The vehicle combined an open third class area and separate first class accommodation.

This vehicle is described in “Historic Carriage Drawings” Volume 1 by N. Campling. ISBN 1 899816 04 6 page 94. One of these coaches has been preserved and is stored at the Keighley Worth Valley Railway.

These vehicles lasted well into the grouping period and travelled extensively over the rail system after grouping.

 Click on the image or here: GN04-D129 to link to the product page

GNR Brake Van "O" Gauge
This "O" gauge kit is will enhance any layout. The kit is based on a well known type produced by the Great Northern Railway for many years. Examples of this type of brake van could be found after grouping and beyond.   This model represents the horizontal planked variant of this vehicle.   This kit is not difficult to make and would make a good starter project   The assembly instructions are available here: PDF  Instructions Click on any image or here for more information: GN07-W001   or on the product page
GN04-D189 Composite brake

GN04-D189 45ft composite brake This coach kit, GN04-D189 45ft composite brake is now available.

This 45 foot coach ) was designed by Howlden for the GNR in the 1890’s.. This vehicle combined  third class, first class and a guards compartment.

This vehicle is described in “Historic Carriage Drawings” Volume 1 by N. Campling. ISBN 1 899816 04 6 page 94. This was a long lived vehicle and survived well into the grouping period.

 Click on the image or here: GN04-D189 to link to the product page.

GNR Brake Vans, 4mm scale

GNR brake van (vertical planks)Our  4mm scale models of a Great Northern Railway brake vans are offered in two versions. The version with vertical planking  GN04-W002 is a companion model to the brake van with horizontal planking (GN04-W001)

The brake van illustrated with vertical planking  was a 20 ton version that replaced earlier vans from the early 1900's onwards. It was given diagram 1602/N and replaced the earlier van with horizontal planking.

LNWR 4 compartment coach 4mm scale

LNWR 4 compartrment third assembledThe latest D3D kit is a 4mm version of a LNWR 4 compartment coach which was originally made for 7mm scale.  As with all our 4mm scale kits so far, this  is a "bodyline" kit, the underframe details are left to the modeller. The illustration reflects the livery of the vehicle at the time which was green with light upper panels.  The construction takes advantage of the strength of MDF combined with the detail of the card components to give a sturdy result. The model has a detachable roof.

Click on either the images of follow this link LNW401 to view the product

LNW401 4 Compartment Third exploded diagram

LNWR Open Carriage Truck "O" Gauge

This 7mm / "O" gauge kit is straightforward to build and will enhance any early pre-grouping layout.

The model represents a  London & North Western Railway (L&NWR) open carriage truck.

This is a type of vehicle that was long lived and commonly seen in passenger trains during the pre-grouping era. The model is based on historical documents and references.

Click on any image or here LNW705 to visit the product page

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