Brewster is a solid diesel-electric train built for heavy loads. He doesn't always understand his own strength, which can make him a bit awkward and clumsy. He is prone to blushing too! Brewster is somewhat earnest and takes things at face value. Whenever the trainees are given instructions, Wilson and Koko are always raring to go - but sensible Brewster usually asks lots of questions first. This can be frustrating for the others at times, but more often than not his eye for detail can come in very handy. Brewster is very dependable and can always be relied on in a crisis, he's a tower of strength. One of his catchphrases is 'Honking horns!'
Dunbar, the shunting engine, ensures that the Chuggers are hooked up with the right rolling stock. He has a strong work ethic and takes great pride in the role he plays in shaping the young trainees to be successful, hard-working engines. He acts as a mentor/teacher to them. Often he will take them to the training or loading yard for a practice session. Dunbar likes to be sure that the youngsters know how to control new rolling stock before they venture off for the day. When the trainees get frustrated and want to give up, Dunbar encourages them to keep on trying. He is full of helpful tips and advice. His catchphrase is 'Let's get those wheels to the rails!'.
Calley is Dunbar's feisty assistant. She is also a shunting engine, but is much smaller than Dunbar. Calley has her own set of service cars to perform her many different tasks - eg with a fuel car attached behind her, she is able to refuel the Chuggers. In the event of a fire, she has a fire service car with hoses to put out the flames. And if a Chugger ever breaks down, then Calley is also the rescue Chugger. She loves to use her flashing yellow warning lights when she's out on an emergency. Below Calley's shed is an underground chamber containing all her rolling stock. In the event of an emergency, she is lowered underground to a turntable, so that she can quickly hook up to her rolling stock, before shooting off through a network of tunnels that take her under the city. She's like a big sister to the trainees. Her catchphrase is 'Absotootly!'.
Emery is a rapid transport train that zips all over town. Sometimes he goes underground, and other times he passes overhead on elevated tracks. He often shoots through the main depot on his way somewhere with a quick quip or joke. As he whizzes past, mischievous Emery will tell an unsuspecting Chugger that their wheel is rolling off, they are leaking fuel or that they've forgotten their rolling stock, and with that he is gone. Just as the poor Chugger tries to look, Emery will suddenly whizz overhead chuckling and taunting: 'Made you look, made you steer... made you have to change a gear!' When he gets very excited, his front window flips up. He has two voices, a nasal announcer's voice, and his normal voice. He goes back and forth between the two, sometimes in the same sentence!
Smooth Harrison thinks he's the cat's whiskers! (And the vents on his face even make him look a bit like a cat.) He lives in the upper level of the roundhouses, the penthouse suite, accessible by an elevated turntable. He is generally considered to be the fastest Chugger in Chuggington and has had his name on the trophy for the Great Chugger Championship as long as he can remember. Wilson hero-worships him.
Irving handles the rubbish and recycling and has a recycling area off the main depot. He's an adult Chugger with a perfectionist streak!
Koko is a fearless, streamlined passenger engine built for high speed. Unlike Wilson and Brewster, Koko is completely electric and draws her power directly from the tracks beneath her. She'll often challenge others to a race, knowing full well that they don't stand much of a chance against her. Koko loves going flat out, whooshing ahead of the others, and has yet to learn that speed isn't everything. Koko is very confident and loves to explore and have adventures. Although mischievous, she is well meaning and gets upset if she causes her friends to get into trouble. Koko will always own up or apologise and try to put things right, once she has understood the full implications of her actions. Her favourite catchphrases are 'Traintastic!' and 'Chugga chugga CHOO CHOO!'.
Morgan is the senior mechanic at the depot and is in charge of the maintenance of the Chuggers. It is a big honour to have his job and he is highly respected in Chuggington. Morgan is a gentle and caring person who reassures the Chuggers when they have to have repairs done. He also designs parts and is a bit of a whizz on the lathe. He has a collection of spares above the repair shed - which is starting to look a little like a museum! Morgan lives close to the repair shed and has a very wilful and energetic young dog named Peckham. Peckham loves to ride the rails and will often sneak aboard a Chugger, stick his head out of the window and let the wind blow through his ears.
Pete is the oldest train in Chuggington - he's 150 years old. He's been looked after very well though and he can still chuff up and down the tracks (albeit slowly and wheezily). He likes to use lots of 's' words, as his steam gives them extra punch and he has a real sense of humour. He loves nothing better than watching the trainees work and learn, whilst passing on his wisdom. Puffing Pete drives the youngsters mad with his endless stories of how things used to be. They get frustrated when they go out with him because he likes to take things slow and steady. But usually they realise that his years of experience are invaluable and he does know what he is talking about.
Vee is the warm voice of the Announcer. She has the important role of keeping Chuggington running on time and to schedule. Although we never see Vee, she is everywhere, well anywhere there is a loudspeaker that is! Vee is a motherly, caring figure with a soft spot for the trainees - always ensuring they understand her instructions and always on hand to help. This requires a great deal of patience sometimes, especially when she's answering Brewster's endless questions and double-checking that Wilson is paying attention. Vee is usually the first to pick up on anything going wrong - or right, for that matter - and always congratulates the trainees on a job well done.
Wilson is a lively multi-function engine with lots of enthusiasm, but this eagerness isn't always matched by his ability to pay attention to instructions, so he often finds himself in deep water. For example, he may pay attention to the dispatch board to see which tunnel to take, but as he emerges on the other side, he realises that he forgot to listen to where he's supposed to be going! Wilson sometimes gets frustrated that he's not as strong as Brewster or as fast as Koko, but he just hasn't fully understood his own special talents yet. Wilson has lots of confidence in his everyday surroundings, but is suddenly unsure when presented with something new or unfamiliar. His catchphrases are 'It's training time!' and 'Let's ride the rails!'.