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Related Topics TT Gauge Hub Gauge Comparison For Beginners Analogue or Digital? Digital Model Railways Decoder Finder Interfaces PIKO TT 2026 TT Steam Locomotives
The middle scale between H0 and N

TT Gauge Model Railway: Planning, Track & Digital Control

TT gauge combines a scale of 1:120 with a standard-gauge model track width of 12 millimetres. It offers more visible detail than N gauge while requiring considerably less space than H0. This overview connects vehicles, track, digital equipment, buildings, figures, scenery and more than 100 suitable shop destinations.

Scale 1:120 Standard gauge 12 mm Over 100 direct links
Plan a Layout Product Categories TT Products
TILLIG 01500 MAV TT-gauge freight-train beginner set Roco 7590019 TT-gauge Class 185 electric locomotive with sound
Compact, visible and versatile

What is a TT-gauge model railway?

TT traditionally stands for “Table Top”. On the European market, standard-gauge vehicles are predominantly represented at a scale of 1:120 on track measuring 12 millimetres between the rails. A full-size passenger coach measuring 24 metres is approximately 20 centimetres long in the model.

TT sits exactly between H0 and N. Compared with H0, longer stations, hidden yards and open routes can be built within a smaller area. Compared with N, vehicles, couplings and separately fitted detail parts remain larger and easier to handle.

The range is particularly strong for DR, DB, DB AG, ČD, PKP, ÖBB and private railway companies. In addition to historic Reichsbahn trains, modern Vectron, Taurus, Traxx and regional multiple-unit models are available.

Planning advice
The vehicle radius matters more than the tightest track radius

A common TT model-track radius is 310 millimetres. Long coaches, express steam locomotives and modern multiple units look considerably more natural on radii of 353 or 396 millimetres.

More railway without losing clearly visible detail

Who is TT gauge particularly suitable for?

Limited hobby rooms

TT provides more station and route length than H0 without becoming as delicate as N gauge.

DR and Reichsbahn enthusiasts

Locomotives, rebuilt coaches, Städteexpress trains and freight wagons from Eras III and IV are particularly well represented.

Modern railway themes

Vectron, Taurus, Traxx, Desiro and international freight wagons support contemporary Era VI layouts.

Digital modellers

DCC, sound, PluX12, Next18, function mapping and modern command stations can be integrated effectively.

Layout builders

Model track, flexible track, roadbed track, slim turnouts and extensive scenery accessories provide considerable freedom.

Collectors

Complete train formations require less display space than H0 while remaining clearly visible.

Base area, curve radii, gradients and usable lengths

Plan a TT-gauge model railway correctly

1

Define the operating concept

Main line, branch line, shunting layout or compact continuous circuit.

2

Select the curve radii

310 mm is compact; 353 and 396 mm provide a more natural appearance.

3

Define the train length

Size platforms and storage sidings for the longest train formation.

4

Ensure access

Keep tunnels, turnout drives and the hidden yard accessible.

Planning area Recommendation Practical benefit
Curves Check the vehicle-specific minimum radius Long coaches and large locomotives operate more reliably.
Gradient Keep it as gentle as possible and use smooth transitions Tractive effort and coupling reliability are maintained.
Platform Position the longest planned passenger train Future extensions to the train remain possible.
Hidden yard Provide large access openings and feedback Faults remain detectable and accessible.
Power supply Use several feeds and short cable runs Voltage remains even throughout the layout.
Reduce prototype lengths

Calculate dimensions at a scale of 1:120

For TT, divide the prototype measurement by 120. A platform measuring 120 metres in real life requires one metre in the model. A 24-metre passenger coach measures 20 centimetres.

The calculator compares the model length with Z, N and H0. This quickly shows how much layout space TT saves compared with H0.

Scale Calculator

Enter the prototype length in metres.

Z Gauge · 1:220 10.9 cm
N Gauge · 1:160 15.0 cm
TT Gauge · 1:120 20.0 cm
H0 Gauge · 1:87 27.6 cm
Conventional direct current or modern decoder control

Should TT gauge be operated in analogue or digital mode?

Analogue operation

Voltage and polarity control the speed and direction. Starter sets provide a straightforward introduction.

Digital operation

Each locomotive has an address. Lighting, sound, shunting mode and additional functions can be controlled individually.

Typical interfaces

PluX12, Next18, PluX16 and NEM 651 are particularly common in TT.

Before digital conversion
Do not confuse PluX12, Next18 and NEM 651

Check the vehicle instructions, contact count, installation space and motor current. A decoder that fits mechanically may still be electrically unsuitable.

Roadbed track, model track and flexible track

Which TT track system suits the layout?

Track system Construction Strength Suitable for
TILLIG Roadbed Track Track with integrated roadbed Quick assembly and straightforward expansion Starter sets, floor layouts and portable layouts
TILLIG Model Track Track without a fixed ballast bed Individual radii, flexible track and detailed scenery Permanent layouts and modules
Kühn TT Track Fine track system without fixed roadbed Slim geometry and custom layout construction Prototype-oriented track plans
Track Sets Pre-planned complete track combinations Suitable quantities for specific layout plans Horka, Breitungen and Lößnitz
TT Narrow-Gauge Variants
Standard gauge, metre gauge and narrow gauge at a scale of 1:120
Designation Model track gauge Typical prototype
TT 12 mm Standard gauge 1,435 mm
TTm 9 mm Metre-gauge railways
TTe 6.5 mm 750, 760 and 800 mm narrow gauge
TTi / TTf Approximately 4.5 mm Industrial and field railways
Access the complete TT range directly

Product categories for vehicles, track and layout scenery

TT Steam Locomotives DR, DB, DRG, PKP and special models TT Diesel Locomotives V 100, V 180, Traxx and private railways TT Electric Locomotives Taurus, Vectron, Traxx and Reichsbahn TT Railcars Desiro, RegioShuttle and historic multiple units TT Passenger Coaches Rebuilt coaches, express coaches and regional traffic TT Freight Wagons Tank, container, refrigerated and open wagons TT Starter Sets Complete trains with a track oval and controller TT Track Model track, roadbed track and flexible track TT Turnouts Straight, curved and crossing turnouts TT Track Accessories Rail joiners, drives and track components TT Track Sets Pre-planned track combinations TT Track Planning Planning documents and track plans TT Signals Semaphore, colour-light and shunting signals TT Lights Platform, street and building lighting TT Overhead Line Masts, contact wire and accessories TT Locomotive Decoders PluX12, Next18 and NEM 651 TT Sound Decoders Vehicle sound and loudspeaker technology Building Boards and Walls Roads, paving, roofs and masonry TT Railway Staff Drivers, shunters and passengers TT Animals and Figures Agriculture and populated scenery
Vehicles, track, buildings and digital technology

Important manufacturers for TT gauge

TILLIG Modellbahnen logo
TILLIG Models and Track
PIKO model railway logo
PIKO TT Gauge
Roco model railway logo
Roco TT Gauge
Arnold model railway logo
Arnold TT Gauge
Auhagen model railway accessories logo
Auhagen Buildings
Busch model railway accessories logo
Busch Figures and Scenery
NOCH model railway accessories logo
NOCH Scenery
ESU Electronic Solutions Ulm logo
ESU Digital Technology Vehicles and Track

Kühn Modell

TT locomotives, rolling stock and track systems.

 Specialist Vehicles

Karsei

Railcars and specialist TT models.

 Lighting

Fischer-Modell

Coach lighting and electronic modules.

 Signals and Catenary

Viessmann

Signal technology, lighting and layout control.
Selected products with images

TT starter sets, vehicles, track and digital technology

Begin directly with a complete train set

Beginner sets and digital starter sets

Locomotives, railcars and rolling stock

Selected TT vehicles

Track construction and digital retrofitting

Track sets, decoders and diagnostics

Additional choice without lengthy product cards

More TT products by vehicle and accessory group

More TT Starter Sets

TT Steam Locomotives

TT Electric Locomotives

TT Railcars

TT Passenger and Freight Wagons

Track, Maintenance and Digital Equipment

Explore planning and technology in more detail

Related guides for TT gauge

Size comparison

Model railway gauges compared

Compare Z, N, TT, H0, 0, 1 and G.

Open comparison → First steps

Model railways for beginners

Select the base area, starter set and power system.

Open beginner guide → Control

Analogue or digital?

Compare controllers, decoders and digital functions.

Compare control systems → Digital systems

Digital model railways

Command stations, protocols, decoders and smartphone control.

Open digital guide → Vehicle connection

Compare decoder interfaces

Distinguish between PluX12, Next18, PluX16 and NEM 651.

Open interface comparison → Planning tool

Model railway calculators

Calculate scales, gradients and layout dimensions.

Open calculators →
Frequently asked questions about the middle scale

FAQ about TT-gauge model railways

What scale and track gauge does TT use?

Standard-gauge TT is produced at a scale of 1:120. The distance between the rails is 12 millimetres.

How much space does a TT layout require?

A compact track oval requires approximately a tabletop area. Considerably greater depth should be allowed for generous curves, stations and hidden yards.

Is TT gauge suitable for beginners?

Yes. Roadbed track and beginner sets provide a straightforward start. The vehicles are easier to handle than N-gauge models.

Which curve radius is suitable for TT?

A radius of 310 millimetres is a common compact choice. Long vehicles look better on radii of 353 or 396 millimetres.

Roadbed track or model track?

Roadbed track can be assembled quickly and suits portable layouts. Model track provides greater freedom for ballasting and route alignment.

Can TT gauge be operated digitally?

Yes. DCC is widely used. Modern TT vehicles frequently have PluX12, Next18 or PluX16 interfaces.

Why is DR Era IV so popular in TT?

TT has a long tradition in eastern Germany. The range of Reichsbahn locomotives, rebuilt coaches and freight wagons is correspondingly extensive.

Can vehicles from different manufacturers be combined?

Yes. Their scale and track gauge are the same. The coupling, minimum radius, era and electrical equipment should nevertheless be checked.

Which decoder interface is most common in TT?

PluX12, Next18 and NEM 651 are frequently encountered. The specific vehicle instructions remain decisive.

Which TT narrow-gauge variants are available?

In addition to 12 mm standard gauge, TTm uses 9 mm, TTe uses 6.5 mm, and very narrow industrial and field-railway variants are also available.

TT gauge combines visible detail with credible train lengths

Further gauges, planning tools, manufacturer guides and step-by-step instructions are available in the central model railway guide.

Open the Model Railway Guide