Bertram (mispelt as Bertrum) is a narrow-gauge engine who is nicknamed, "The Old Warrior" for his bravery.
- Bertram (TrackMaster [HiT Toy Company])
- Bertram's body, like in the television series, is Duke's model repainted, but with some changes, such as a wider, shorter, and flatter cab, a thinner buffer beam, a taller smokebox, and a shorter funnel. His tender is also substantially larger than Duke's. This may have been done so as to demonstrate that they are two completely different engines.
- Bertram's model has golden stripes instead of red stripes, which are seen on his prototype and in the show.
- Bertram is one of some engines to never be released in TOMY form.