Baureihe 423

About the real one:

AdTranz/Bombardier built DB class 423 EMU used for S-Bahn passenger services in the Rhein-Main Metropolitan area. Together with their successor classes 422/430 they form the backbone of four West German S-Bahn systems and are operated solely by the Deutsche Bahn company.

Each 4-car unit has two seperate traction equipments, connected to one single pantograph. A total of eight out of ten axles are driven by watercooled 3-Phase-AC-traction motors, which are also used for dynamic braking. The same eight axles feature conventional electropneumatic braking equipment, with the Jacobs-bogie in the middle being neither braked nor powered, as this bogie is equipped with sensors for speedmeasuring and parts of the “WSP” (wheel slip/slide protection).
Furthermore each unit is fully airconditioned and 24 doors ensure a fast passenger exchange at the stations.

About the moc:

Original idea by “Kai P.” from somewhere around 2008. When I build this train in 2016, his initial moc was heavily modified by me and further updated throughout the years as new parts and techniques became available.
Click here for a video of the original 2008 moc.

The moc itself consists of four individual coaches with fully detailed interiors, such as passenger compartments and the drivers cabs. Many of the details are as close to the real train as possible, notably the arrangement of the underside and roof mounted details.

This moc is for experienced builders!

Custom parts: Ball bearings

Optional parts: Metal washers to recreate the disc brakes on axles 3,4,7,8 (get them from any DIY-store)

Minimum radius: R104

Rare parts: This set contains a large amount of rare/discontinued/expensive parts. I’d recommend to use third party products as substitutes for the 48 red train windows with inserts.

Power: 9V by default, Power functions or Powered Up can be used too but requires modifications to fit the battery boxes and receivers.

Behind the scenes:

One of the main reasons why I’ve build this moc isn’t its sheer size and complexity, but more the fact that I’m actually certified to operate the real train! My knowledge of the vehicles insides and outsides really helped me recreating it with bricks, hence the addition of rather small and perhaps unneccessary details.

Last but not least, any feedback or criticism regarding the moc or the instructions is greatly appreciated. Also tell me if there are any errors or mistakes in the build/instructions (took me a whole week to create the thing…).


The Danish State Railways’ (DSB) highly successful and innovative InterCity 3 aka IC3 passenger train was co-developed by Siemens -Duewag in Germany and ABB Scandia in Denmark.

The train is operated by DSB in Denmark and Sweden, by Renfe Operadora in Spain and by Israel Railways in Israel.

Amtrak in the USA and Via Rail in Canada have tested the train in the past.

A trainset consists of three units; two diesel motor units (Litra MFA and Litra MFB) and one intermediary unit (Litra FF).

Up to five trainsets can be coupled together.

96 trainset were built for DSB from 1989 to 1991.

All are still in service today.

The model:

Original white and red livery used from 1989 to 2002.

Fictionally named “Jørgen Vig” with the crest of Billund added.

Scale: 1:48
Length: 157 studs (MFA: 55 – FF: 47 – MFB 55) or approx. 122 cm
Width: 8 studs
Bricks: 2.948 (MFA: 1.040 – FF: 861 – MFB 1.047)
Locomotion: 2 x 9v or 2 x PF/PUP train motors
Power: 9v, 2 x LEGO AAA battery boxes or 2 x BuWizz battery boxes
Control: 9v, PUP, SBrick, PFx Brick or BuWizz
Designed: 2022
Building instructions: Knud Ahrnell Albrechtsen aka

Its able to navigate R40 but looks rather silly doing so.

The model has been built and extensively tested in real life for more than a year but you are more than welcome to contact me regarding any errors in the file, building instructions or the model itself. Feedback is always much appreciated.

Artwork for the stickers will be added on a later date.

More pictures:

12.09.2023: Model and Building Instructions download version 1.1: Important corrections to the central bogies