Ivor

Ivor is the steam locomotive of the Merioneth and Llantisilly Rail Traction Company Limited. Unlike real ones, he has a mind of his own. Ivor can drive himself and use his whistle to communicate. His fondest dream is to sing with the Grumbly and District Choral Society, a dream that is realised when his whistle is replaced with three pipes from an old fairground organ. He becomes the first bass of the choir, as well as providing them with a means of getting from place to place.

Ivor enjoys doing all sorts of things that humans do. As well as singing in the choir, he likes visiting the seaside, making tea from his boiler and spending time with his friends. He is fond of animals, and has several of them among his friends. He can be wilful and disobedient at times, and it is not unknown for him to go and do his own thing when he should be working. He dislikes shunting and timetables.

Jones the Steam

Edwin Jones is Ivor's driver. He is a cheerful and kind-hearted man who perhaps sympathises more than most railway staff with Ivor's idiosyncrasies. Postgate and Firmin describe him as "an ordinary engine driver who is there to cope with whatever needs to be coped with". People who are new to the area find him rather eccentric for talking to his engine.

When not driving Ivor or helping the engine with his latest flight of fancy, he enjoys fishing and day-dreaming.

Dai Station

The station master at Llaniog. He is a stickler for the regulations of the railway, but sometimes bends the rules to help his friends. His life is made a little difficult by the fact that Ivor really doesn't care much for regulations at all. Although he is often gloomy and overly strict, he is a good person at heart.

Owen the Signal

Owen the Signal inhabits a signal box near Ivor's shed and makes an occasional appearance in the episodes.

Evans the Song

Evan Evans is the portly choirmaster of the Grumbly and District Choral Society.^[8] He is also Jones the Steam's wife's uncle.^[9]

Mrs Porty

A rich and eccentric aristocratic lady who enjoys the occasional glass of port and has new hats sent from London every week. She is also technically the owner of the railway, having bought it when the line was threatened with nationalisation. However, she does not bother much with the day-to-day running and things remained much the same after she bought it.

Mr Dinwiddy

A very odd, possibly insane miner who lives in the hills and digs for gold. He enjoys explosions and mining. In fact, his mountain is full of gold, but as soon as he digs it up, he puts it back again. He often has need of new boots.

He is something of an amateur scientist. He describes himself as "educated" and knows "something about rock". He has constructed a few odd devices, including a donkey carriage and a bubble-blowing machine.

Bani Moukerjee

An elephant keeper from India, who works for Charlie Banger's Circus. He is in charge of the elephants Alice, George, Margaret and Clarence, who all obey him without question.

Charlie Banger

The eponymous and larger-than-life owner of Charlie Banger's Circus, who arranges a free show for the town in order to thank Jones, Evans and Mr Hughes for their help in looking after Alice the Elephant following her injury.

Idris the Dragon

A small, red Welsh dragon who also sings in the choir for a time. Having been hatched from an egg in Ivor's fire, he lives with his wife Olwen and any of their twins, Daian and Blodwen, in the extinct volcano Smoke Hill. As well as singing, he proves useful by cooking fish and chips for the choir using his fiery breath.

On the other hand, Idris runs into trouble when Smoke Hill goes cold and needs to be kept hot in order to survive. The gasboard provide a temporary furnace, but when that became too expensive (and decimalisation renders the slot-machine inoperable), the only other option for the dragons is a heated cage. Luckily, Mr Dinwiddy is able to provide a solution, and they now live in a geothermally-heated cave under the ground.

Alice the Elephant

A circus elephant with Charlie Banger's Circus. She is normally placid, but does not like taking medicine or being bathed by anyone except her owner, Bani Moukerjee. When Ivor met her, she had escaped and was asleep on the track with an injured foot. Since then they have become friends. She and her elephant friends were able to help Ivor when he got stuck in the snow.

Bluebell the Donkey

A donkey who lives at Mrs Porty's house. She cannot talk, but she and Ivor just enjoy sitting around together. As the Merioneth and Llantisilly Rail Traction Company Limited has only one locomotive (apart from the short service of Juggernaut), Bluebell is sometimes called upon to provide motive power. Examples include the towing by chain of the broken down locomotive Juggernaut and also the pulling of Mrs Porty's donkey cart when this was temporarily set on the railway tracks to pursue 'robbers' when Ivor had been 'stolen' in the episode The Lost Engine; in this latter case, like a locomotive, Bluebell strictly observed the railway signals, halting the chase until Owen the Signal had raised the signal arm.

Morgan the Roundabout

Mr Morgan is the fairground owner. He gave Ivor some pipes from the steam organ on his roundabout, so that Ivor could sing in the choir. He only appeared in the very first black and white series.

Claude Gilbert

Claude Gilbert was the station master of Tan-y-Gylch station in the original black-and-white series, and would share a cup of tea with Jones whilst Ivor rested at the platform. It was he who directed Jones and Dai to Mr Jenkins the Builder when they were searching for organ pipes to replace Ivor's whistle. Like Mr Morgan, he only appeared in the first black and white series and was not seen again.

Mr Hughes The Gasworks

The gruff but kind-hearted proprietor of the local gasworks, he is well known for keeping pets, in particular budgerigars. He is asked to provide shelter for Alice the Elephant when she has an injured foot, and, despite his initial reluctance, he more than rises to the occasion.

Miss Ludgrove

The local vet, with a dry sense of humour, who comes to examine Alice's injured foot.

Mr Brangwyn

A robust and larger-than-life pigeon-fancier, who occupies a house by the railway, and is engaged to Miss Price from Llangubbin. It is Mr Brangwyn who provides the elephant's boot for Alice: he obtained said boot during the time he once spent in India.

Mrs Williams

The local postmistress, who is a bit batty and a bit of a gossip. She occasionally interacts with Jones and Ivor.

Eli The Baker

The feisty but big-hearted and hard-working local baker.

Mrs Thomas

The local fish-and-chip shop owner. A plump woman with a big voice, she is kind and cheerful and serves the choir with food after their sessions.

Policeman Gregory

Mainly known as P.C. Gregory. The local and only village policeman. One of his most notable happenings is after Ivor went to keep the chickens warm on his boiler. Jones and Dai find 3 small eggs in Ivor's coal bunker, and after a small "finders-keepers" argument they are interrupted by P.C. Gregory, who then removes his helmet (which was padded on the inside) and takes the eggs. After he leaves Dai asks if the farmer will ever see those 3 eggs again, as P.C. Gregory likes a good egg in the morning.

Professor Longfellow

This seemingly batty professor was only seen in a few episodes. He was famously known for ordering a telescope cover; however, as it was one of Ivor's deliveries, Mrs Porty believes it is her newest hat, and wears it to a meeting later in the episode. He was also notable for telling Jones, Idris, and Dai, that the closest active volcano to the now extinct "Smoke Hill" is in southern Italy.

Mr Mervin

The local bank manager. He only appears in a few episodes; his most notable appearance is his and Jones's adventure to find more half-crowns for the gas meter powering "Smoke-Hill". As this episode takes place when decimalisation occurs, Jones must inform Idris and Co. that there are no more half-crowns in Wales and that "you have had the lot". They go and find in a small shop, an old tin teapot full to the brim with half-crowns. "Smoke-Hill" is gas fired for the final time until the dragons go to Mr Dinwiddy and his geothermal heated cave.

Mrs Griffiths

Mrs Griffiths is a member of the Welsh Antiquarian Society and a passionate believer in Dragons. She first came to seeking Jones the Steam in hopes of finding Idris the dragon, after hearing that dragons had been sighted in Llannyog. Idris had already run away by this point after learning that people were looking for him so Jones misled Mrs Griffiths into giving up the search by pretending to be an insane person who spoke to railway engines (Ivor enhanced Jones' performance by not blowing his own whistle).

When Idris' home Smoke Hill lost its heat, Jones and Ivor took Idris to see Mrs Griffiths in her shop in Llanmadd. After seeing Idris and his brethren, and Ivor's self-whistling, Mrs Griffiths apologises to Jones for thinking him mad and agrees to help the dragons. Mrs Griffiths and her fellows at the Antiquarian Society hire Mr Hughes the Gasworks to fit out Smoke Hill with gas heating and in the series one finale Smoke Hill, now a gas-fired volcano, is reignited and all the characters sing in gladness. However, the gas-heating includes a gas meter that only takes half-crowns, which are no longer "legal tender". On a few occasions, the gas meter runs out and Jones and Ivor have to search high and low for more half crowns.

Eventually, they use up all the half crowns in their part of Wales so they return to Mrs Griffiths for help, but Jones leaves Ivor alone in a siding while he speaks to Mrs Griffiths and two of the dragons, who were in Ivor's firebox, decide to fly about the town. They come across a statue of St. George famously slaying a dragon. The dragons, being quite young and naïve, attack St George's statue with jets of fire in the hope of saving the dragon. When Mrs Griffiths and Jones the Steam arrive, she - being horrified by the sight of two dragons attacking the statue - accuses them of vandalism and tells Jones to take them away.

Juggernaut

The Juggernaut is a diesel rail lorry made out of bits, bobs and flanged wheels, which appears towards the end of the series. Due to its inadequate brakes, it runs down a hill and falls into the lake soon after starting service, nearly killing Idris, whom it was carrying on a chestnut barrow.