Robot trains

Duke is a fast and tall robot train, shorter than Jeffrey, capable of transforming into both a robot and a train. He's serious and rarely smiles. He usually enjoys solitude, but sometimes spends time with his friends and trains with Kei. He's black and gray, and consists of a Deltaboard (like a skateboard) and Delta Boosters. He's Kei's best friend, equal in strength and speed to Kei, and the most powerful. He lives in his base under the fountain at Fountain Square (height 190, 30 years).
Duke became your so-called father (that's what you called him), he led you by the hand, let you sit on his head, etc. In short, he did what a father does to his child.

Jeffrey is the tallest robot train, capable of transforming into a robot and a train. He's dark green and yellow, and has the ability to stop someone with the command "Stop!" Polite and understanding. He's the boss. (Height: 210.65 years)

Becky is a small train similar to Sally, also female. She's Sally's assistant and sister-type. She can only say her name and emit a scanning beam that reveals any faults in the tracks or portal tunnels. She's sweet and very kind.

Sally is a smart female robot train. She can transform into a robot and a train, and she can program various things, monitor the rails, and even use nano-bombs. She's pink and white, and has a sister/assistant named Becky. (She can only say her own name, but Sally understands her.) She's excellent at fixing other robots. (Height: 172.21 years.)

Duckling - A cheerful and playful robot train, a bit clumsy and sometimes childish, he can transform into a robot and a train. He is the shortest of the robot trains. He is yellow and red and has his own components: a water gun and a water cutter, but the water is limited. He can swim on water. He adores Kay and (height: 155.17 years).

Alf is a climbing robot train that can transform into both a robot and a train. He's red and white, and has his own components: boosters that release a rope, boots, and a backpack-like device that can drop a net. He's Kay's best friend. He's a bit distrustful of Duke after the glitch with him and his virus. He's a bit serious, but kind (height 180, age 24).

Kay is the fastest robot train, capable of transforming into both a robot and a train. He's blue and yellow and has his own components: rollers, boosters, and an accelerator. He's Alpha and Duke's best friend and the team leader. He's kind and optimistic (height: 170 cm, age: 19).