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Frequently asked questions
What are the different size body's for?

Four different main body lengths are offered to support realistically scaled and interchangeable top designs, accounting for variations in roller coaster car length, width, and seating configurations across manufacturers.

Compact Body

Designed for single-row seating top designs where each row has its own pair of wheel assemblies. Ideal for inverted coasters or compact family coasters.

Classic Body

Matches the length of the previous V2 train system and is compatible with all existing V2 top designs when used with the included adapter plates. This body length is now used exclusively for wooden and RMC-style top designs.

Scale Body

A slightly longer body designed for modern steel coasters with more legroom between rows. This also allows the rear wheel assemblies to sit in a more realistic position. Suitable for Intamin-, Vekoma-, or Mack-style top designs.

Extended Body

Designed for longer car layouts, such as three-row seating or specific coaster models like Ice Breaker or AlpenFury.
I already have the V2 system — is there an affordable upgrade path?

V2 and "TKM K’nex Train System" are not directly compatible due to tighter tolerances on the new trains.

A more affordable upgrade option will be available for existing V2 customers, allowing unchanged components—such as wheel assemblies, axle bars, and compatible brake run bars (3 mm × 25 mm)—to be reused.
What is the difference between V2 and the TKM K’nex Train System?

The TKM K’nex Train System introduces a redesigned platform built around four different main body lengths, allowing top designs to be accurately scaled for different roller-coaster styles and layouts. Universal components—such as wheel assemblies and brake bars—can be reused across shorter or longer bodies, making it easier to achieve correct real-world proportions and a more realistic overall appearance.

In addition, the TKM K’nex Train System has undergone a full redesign to improve performance and quality. The new system is lighter, features stronger and more precisely tuned braking performance, and benefits from tighter tolerances and higher print quality—resulting in a smoother, more refined, near injection-moulded feel.

In addition, the chain catch has been completely redesigned for improved reliability, featuring a much steeper activation angle. It now only begins to fold away at a lift hill angle of approximately 50°, and remains fully engaged up to 70°+, significantly reducing the risk of unintended disengagement.
What’s included, and do I need to buy anything separately?

TKM K’nex Train Systems include everything required to build the train system itself, excluding bearings and top designs.

Top designs are sold separately and can be found on their respective product pages. They are organised into Compact, Classic, Scale, and Extended categories, making it clear which body size each design is intended for.

Bearings are also purchased separately. Detailed information on compatible bearing types and sizes can be found on the Bearings information page, accessible from the top navigation.

For existing V2 customers, current bearings can be reused, as the TKM K’nex Train System uses the same wheel assemblies and bearing sizes as V2. Any future upgrades—such as HD realistic wheel assemblies—will include full compatibility details on their dedicated product pages, with additional requirements (such as spacers or alternative bearing sizes) clearly documented and added to the Bearings page.