An assortment of 1992 chassis (top right, bottom right, and left)
- When first made, chassis were simple and had staples at the bottom, likely due to the nascence of the brand and its manufacturing practices
- This type of chassis was phased out during 1994 when the succeeding type came into usage. As a result, some 1994 examples of items used either type
- The stapled bottoms removed and replaced with non-stapled bottoms
- This type of chassis was introduced while the preceding type was retired. As a result, some examples of 1994 often used either type
- Some models dated 1999 have names in "Western" font.
- Vehicle names added
- Names rewritten to a more bolded format.
- Engines or rolling stock with multiple bogies (with the exceptions of Frieda and Vinnie) refitted with plastic chassis, likely to cut production costs
- Magnets are directly embedded into the chassis.
- Single bogie engines, rolling stock, and tenders still use wooden chassis, with a plastic strip placed into the top in order to hold the magnets and secure the model to the base. The magnet housing is now a duller matte plastic, as opposed to the glossy plastic used before.
There are four basic types of chassis:
- Stapled Bottoms (discontinued)
- Non-Stapled Bottoms (discontinued)
- Non-Stapled Bottoms, Names (active only on non-bogie engines)
- Non-Stapled Plastic Bottoms, Names (active)
Chassis have two different bogie configurations:
- Without bogies (4-6 wheel vehicles)
- With bogies (8 wheel vehicles)