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Roco locomotives, coaches, wagons, track and digital technology →
All Roco TT Track-Set Product Groups

Roco TT Track Sets: 21 Layouts & Extension Set

Explore 20 complete layout track sets, the first construction stage of Hohenstein and the 35901 extension set for the Roco TT turntable. This overview compares base dimensions, track lengths, radii and suitable applications.

View All Layout Sets Understand the Track System View Heidenau
20 complete layout sets
1 Hohenstein stage
1 turntable extension
1:120 TT with 12 mm track gauge
Roco TT Heidenau track set with an interwoven track plan
Heidenau Example Layout 2.40 × 1.40 m · 29.67 m of track · straight and curved turnouts
Track Planning at 1:120 Scale

What is a Roco TT track set?

TT gauge combines clearly visible detail with comparatively modest space requirements. Standard gauge is represented at a scale of 1:120 using a model track gauge of 12 millimetres.

A layout track set combines the Roco TT track required for a specific plan. Depending on the concept, this includes straight sections, R1 and R2 curves, straight turnouts, curved turnouts, double-slip turnouts and short compensation pieces. The sets avoid the need to compile an extensive parts list manually.

The place names identify different layout concepts. Thierstein begins at 1.55 × 0.85 metres. Schlegel uses a total of 50.77 metres of track within an area of 2.80 × 1.65 metres. Hohenstein is a special case: Stage 1 is supplied, while the dimensions and track length shown in the illustration describe the later complete plan.

Vehicles, buildings, scenery materials, power supplies and turnout drives are not automatically included. The package listed on the relevant product page is always authoritative.

Selection rule: Do not compare the external dimensions alone. Usable track lengths, accessibility, radii, gradients and concealed routes determine whether a plan suits the available room and intended vehicles.

Technical Foundation

How does the Roco TT track system work?

Roco TT track is a two-rail system without a moulded ballast bed. It can therefore be supported, ballasted and integrated into the scenery individually.

Fine Rail Profile Without Roadbed

The rail profile is 1.8 millimetres high. The base, sound insulation and ballast are added to suit the particular layout project.

Two-Rail Track for Analogue and Digital Operation

The DC designation identifies the two-rail system. With a suitable power supply, the same track can be operated in analogue form or digitally using DCC.

Geometry Based on 128.7 Millimetres

G128 is the standard length. Shorter straights, radii and 20-degree turnouts compensate for branches and parallel tracks.

Track Component Dimension or Radius Purpose Within the Track Plan
G44 / G60 / G64 44 / 60.5 / 64.3 mm Compensate for short lengths and complete turnout formations
G121 / G128 120.96 / 128.7 mm Compensation straight and standard system length
G640 Flexible Track 640 mm Free radii, transition curves and individual lengths
Radius R1 321 mm Compact curves with angles of 10 or 30 degrees
Radius R2 365 mm Outer curves with angles of 10, 20 or 30 degrees
WL20 / WR20 128.7 mm · 20° branch · 365 mm radius Construct stations, passing tracks and branches
BWL / BWR Main and branch routes use R1 at 321 mm Position a branch economically within a curve

For digital operation, the track is suitable for systems including the Roco Z21 and z21 . On larger layouts, multiple power feeds, detection sections and electrical isolation points should be planned before the track is permanently installed.

Product Group 1

All 21 Roco TT Layout Track Sets Compared

Grouping the sets by maximum layout width simplifies the preliminary selection. The stated track lengths refer to the illustrated plan; only Stage 1 is supplied for Hohenstein.

8 Sets

Compact Plans Up to 1.80 Metres Wide

Small base areas with continuous routes, storage sidings and interwoven running lines.

8 Sets

Medium-Sized Layouts from 1.85 to 2.20 Metres

More track, more extensive turnout formations and varied train sequences.

5 Sets

Large Roco TT Projects from 2.40 Metres

Suitable for long routes, extensive track groups and operationally focused layouts.

Note about Hohenstein: The set offered contains Stage 1. The total track length of 28.64 metres stated in the set illustration describes the fully developed layout plan, not the first construction stage alone.

Product Group 2

Roco 35901: Extension Set for the TT Turntable

The extension set is specifically intended for the Roco 35900 turntable and is not a general extension package for a continuous track circuit.

More Locomotive Roads for a Depot and Roundhouse

The basic Roco 35900 TT turntable has six approach and departure tracks. Several 35901 sets can increase the total number of connections to as many as 24.

The three track pieces have roadbed designed to match the turntable and are inserted directly at its connection points. They therefore do not replace ordinary Roco TT straight tracks.

Contents of 35901 Three additional access tracks
Maximum Expansion Up to 24 track connections
35900 Turntable Bridge 183 mm long
35900 Installation Dimensions 203 mm diameter and approximately 25 mm deep
From Individual Track to Complete Route

Straights, Curves, Turnouts and Accessories Explained

Understanding the designations makes parts lists easier to check and permits an existing layout plan to be modified using suitable track , turnouts and track accessories .

G44 to G128
Straights and Length Compensation

G128 is the standard straight. G44, G60, G64 and G121 close gaps and compensate geometrically for turnout connections.

G640 Flexible Track
Individual Route Alignment

The 640-millimetre flexible track permits individual lengths, generous curves and gentle transitions without numerous rail joints.

R1 at 321 Millimetres
Compact Inner Radius

R1 curves are available with angles including 10 and 30 degrees. Twelve 30-degree sections form a complete circle.

R2 at 365 Millimetres
Outer Curve

R2 is available with angles of 10, 20 and 30 degrees and forms parallel curves as well as the branch radii of WL20 and WR20 turnouts.

WL20 and WR20
Straight Turnouts

The 128.7-millimetre turnouts have a 20-degree branch angle, a radius of 365 millimetres and an integrated snap mechanism.

BWL and BWR
Curved Branches

Both routes use the R1 radius. A branch can therefore begin within a curve and save valuable layout length.

DKW20 Double-Slip Turnout
Crossing and Branch Combined

The DKW20 is 128.7 millimetres long, crosses at 20 degrees and requires two suitable drives for electrical operation.

Joiners and Power Feeds
Mechanical and Electrical Connections

Rail joiners align the profiles. Connection terminals supply traction current, while insulated joiners separate detection or power sections.

Since Roco TT track has no moulded roadbed, track bedding , ballast colour and installation height can be adapted individually to a station, main line or branch line.

From the Room to a Suitable Track Plan

How to Select a Roco TT Track Set

A good track plan suits the room, the longest vehicles and the intended operation rather than merely fitting the maximum board width.

Measure the Room and Access

Maintenance routes, layout edges and concealed track must remain accessible.

Define the Operating Concept

Continuous running, stations, shunting and locomotive depots require different track plans.

Check Vehicle Radii

The specified minimum radius of each vehicle remains binding.

Compare Usable Track Lengths

Station and storage sidings must accommodate the intended trains.

Plan the Electrical System

Define power feeds, isolation points and occupancy detection before ballasting the track.

Carry Out Test Operation

Test every type of vehicle before fixing the track permanently.

Smallest Base Area

Thierstein requires approximately 1.55 × 0.85 metres.

High Track Density

Wutzingen combines 43.02 metres of track within 2.00 × 1.00 metres.

Locomotive Depot

Blankenburg and Freiberg integrate a Roco TT turntable.

Longest Track Route

Schlegel reaches a total track length of 50.77 metres.

Further assistance is available in Plan a Model Railway , the Track Planning category and the Model Railway Calculators .

Scale and Distance Between the Rails

Understanding TT, TTe, H0m, H0e, H0 and N

The same model track gauge does not automatically indicate the same track system. Scale, sleeper pattern, radii and loading gauge must also be suitable.

Model Size Scale Model Track Gauge Classification
TT 1:120 12 mm The 22 Roco products discussed here belong to standard-gauge TT layouts.
TTe 1:120 6.5 mm TT narrow gauge and not interchangeable with standard-gauge TT track.
H0m 1:87 12 mm The same distance between the rails but a larger scale and different appearance.
H0e 1:87 9 mm A separate H0 narrow-gauge system using dedicated Roco H0e track.
H0 1:87 16.5 mm Roco Line and other H0 systems are considerably larger than TT.
N 1:160 9 mm Smaller than TT and intended for particularly space-saving layouts.

The model railway gauge comparison explains space requirements and scales in greater detail. Although H0m also uses a track gauge of 12 millimetres, it is not a direct substitute for a TT layout concept.

Frequently Searched Answers

Questions About Roco TT Track Sets and Track Geometry

These answers help with system selection, space planning, turnout control and later expansion of a Roco TT layout.

How many Roco TT track sets are included in this overview?

The overview includes 20 complete layout track sets, Hohenstein Stage 1 and the 35901 turntable extension set. A total of 22 suitable Roco TT products are presented.

Which Roco TT track set requires the least space?

Thierstein has the smallest stated base area at approximately 1.55 × 0.85 metres. It is followed by Kühnhausen, Thomashöhe and Hohenwiehl.

Which Roco TT plan contains the longest track route?

Schlegel reaches a track length of 50.77 metres. Wutzingen is particularly track-intensive, with 43.02 metres within an area of only 2.00 × 1.00 metres.

What is included in the Roco TT layout sets?

The product pages list the required straight tracks, curves, turnouts and compensation pieces individually. The 8050009 TT track-plan book is also included. Specialist components are included only when expressly stated.

Can Roco TT track be used for analogue and digital operation?

Yes. It is a two-rail system. Analogue operation uses a suitable controller, while digital operation can use a DCC command station such as the Roco Z21 or z21.

Does Roco TT track have a finished roadbed?

The regular straight tracks, curves and turnouts are used without moulded ballast roadbed. Bedding material and ballast can therefore be selected individually. The turntable access tracks in set 35901 are a specialist exception.

Are electric turnout drives included in the track sets?

The turnouts have a snap mechanism and can initially be operated mechanically. Electric side-mounted or underfloor drives are included only when the relevant set page expressly lists them.

What should be considered when using R1 at 321 millimetres?

R1 permits compact layouts. The product specifications must still be checked to confirm that each locomotive and wagon can negotiate the radius safely. Long vehicles and large locomotives frequently appear smoother on R2.

What is the purpose of the Roco 35901 extension set?

It adds three approach and departure tracks to the Roco 35900 TT turntable. Several extension sets can increase the turntable to a total of up to 24 track connections.

Can other 12-millimetre track be connected directly?

A common track gauge alone is not sufficient. Rail-profile height, connectors, roadbed height, sleeper pattern and geometry must be checked. A system transition should be aligned precisely and tested with every type of vehicle before it is fixed permanently.

Add Suitable Roco TT Track to the Layout Plan

Explore individual straight tracks, radii, turnouts, turntables, vehicles and digital technology for further expansion.

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