Skarloey and his brother Rheneas are the oldest engines on the Narrow Gauge Railway - both built in 1865, and approaching 150 years old like their counterparts Talyllyn and Dolgoch on the Talyllyn Railway within the next decade! Skarloey maybe old and tires out easily, but he always helps his friends and never stands for any nonsense whatsoever. He is a great friend with Edward, who used to bring passengers to travel on Skarloey and Rheneas’s trains years ago. This little old engine has great respect for all railway staff and knows the importance of passengers being their “coal and water” to keep their wheels running.

	Rheneas and his brother Skarloey are the oldest engines on the Narrow Gauge Railway. Rheneas is a real “Gallant Little Engine”. Many years ago, he helped to keep the railway open by bringing his passengers home on one cylinder. As a reward, he was sent away for repairs and was warmly welcomed seven years later. A brave, daring little engine, Rheneas has always brought his train on time and never gives up the fight.

	Sir Handel (formerly named Falcon) worked Duke’s old line and, like Peter Sam, was kept in his place by Duke. Despite being one of the more elderly engines on the Skarloey Railway, he is rather “highly sprung”, believing only what he thinks is right, and his bad temper normally ends him up in trouble. He was eventually sent to work in the Stone Quarry out the way where he came back a better engine...but he still shows traits of his previous behaviour now and again!

	Peter Sam (formerly Stuart) is a busy, bustling little engine, who enjoys hard work and hardly grumbles. He was taught by Duke and has great respect for him. Although susceptible at times, he’s a kind engine and always proves his worth by being a happy little worker. But life wasn’t perfect for Peter Sam - following an accident with slate trucks, his funnel became damaged and wobbly; during winter, it broke off altogether thanks to an icicle in a tunnel. But luckily, he was given a “Special Funnel”, which helps him work harder than ever.

	Rusty is a little diesel engine, who was brought to help when Skarloey was sent for repairs. A friendly hard worker, he is constantly working up and down the line, repairing all the tracks, bridges and tunnels along the Skarloey line, keeping it generally maintained.  Although sometimes given hassle by Duncan for being a diesel, Rusty's good nature often shrugs it off.  Simply loves adventures and a true friend for life.

	Duncan was brought as a spare engine after Peter Sam’s accident.  He keeps busy and means well, but can be bouncy and rude, gruff in his attitude. He enjoys nothing more than doing his Rock ‘n’ Roll, which sometimes leads to his undoing, and hates not having a polish or being overworked. Overall, a kind engine who is a little misguided and misunderstood.

	Duke is one of the oldest of the Skarloey Engines, built in 1880 at Boston Lodge works on the Ffestiniog Railway. He used to work on his old line with Stuart (Peter Sam) and Falcon (Sir Handel). But when their line closed, Duke was locked away in a shed and remained there long after his shed was hidden from view by trees and bushes. He was restored, however, 25 years later by travellers who rescued him and brought him to his new home. The other engines are fond of Duke and his tales of “His Grace” - his insight and knowledge make him very wise indeed, despite sometimes mentioned by his nickname: “Granpuff”. And whenever the other engines do that he thinks is wrong he would be heard to remark: “That would never suit His Grace!” Duke was registered as Skarloey Engine number 8, however he doesn't wear the number for reasons best known to the Railway Management or to the Rev Awdry himself!

	Fearless Freddie has spent a great deal of time away from the railway for reasons very much unknown, and was once the fastest engine in the hills.  But in his old age, Freddie soon discovers that he's not as fit and fast as he once was. But nonetheless, he's still knowledgable of the old tracks through the hills and uses them to his advantage!  Freddie is caring and friendly, and will always do his best for his friends, such as the times he looked out for a new bell for the Thin Controller's new bicycle, and when he tried to organise the Christmas Party at the Wharf for Colin the Crane.

	Bertram is a little narrow gauge engine. He used to work at the old mines near a forgotten castle, but when the mines closed he was put away in a shed for safety. Toby and the Fat Controller discovered both the mine and castle, and it was decided that both would make fine attractions. Toby mistakenly thought Bertram was the “Old Warrior” ghost, but discovered it was a nickname for him being so brave. Although rarely seen these days, Bertram works hard carrying visitors around the restored mines he used to work in all those years ago.

	Smudger/Stanley was a complete show-off, as Duke remembered him in the old days of Duke's Railway.  The cocky American engine rode too roughly and often came off the rails as a result.  He also took very little notice when Duke told him what he was doing wrong.  He soon got his comeuppance when the manager decided that he had found a use for him at last...and Smudger was turned into a generator/pumping engine at the back of the old shed.  Having heard what happened to him, it turned the attitudes of Stuart and Falcon around into Really Useful Engines!

	Mighty Mac are a Double-Fairlie locomotive on the Skarloey Railway, with two boilers and two personalities!  Mighty is the older of the two, while Mac is the younger and more insensible end!  When they arrived on the railway, neither end were able to agree on which way to go when taking passengers into the mountains, both have since learnt sense and have agreed to work together in future.