There are some fast engines on the Island of Sodor like Gordon and Spencer, but there are also two streamlined engines named Connor and Caitlin who come from the Mainland and are even faster than Gordon and Spencer. One day, Connor races into Ulfstead Castle and arrives at the station before Stephen does, Stephen says to Connor that he reminds him of him back in his days at the Rainhill Trials and won every race, Connor laughs and says to Stephen that he probably still has it in him, then Stephen puffs out of the castle station and makes the sound of a rocket while Connor also leaves the station.
Meanwhile, Connor is waiting at the Vicarstown Bridge for the drawbridge to lower down while a ship crosses the Walney Channel, Connor starts speeding up once the bridge is lowered, but as he speeds along the line worrying that he is late to bring his passengers, he hears something clanging and stops to see what it is, the driver and fireman go out and check on Connor only to discover his coupling rods had become loose which nearly caused him to derail, Connor suggests that he was probably going too fast.
Connor is sent to the steamworks and is given a new coupling rod, but he starts fearing at going high-speeds, but Victor tells him that his coupling rod cannot just loosen when going too fast, but at any speed, Connor sadly leaves the steamworks and goes to Ulfstead Castle to deliver passengers, he tells Millie of how he broke down on the Mainland and then says that he is going to be much careful from then on, but this makes Stephen and Millie worry.
Thomas is chuffing along the line when he sees Connor going very slow, Thomas asks Connor why he is going so slow in which Connor explains about his coupling rod and from now on, he is going to be more careful, but Thomas suggests that Connor should go and get checked over again at the steamworks, Connor agrees and Thomas chuffs away going more further away than Connor. Connor continuously repeats "Better safe than sorry" on his way to the steamworks to be re-checked.
Connor returns to the steamworks and tells Victor that he is going very slowly, but he still thinks something is wrong with him, Victor tries to tell Connor there's nothing wrong with him as he is a fast streamlined engine who should be going at high-speeds again, but Connor is still worried about risking again. So Connor continues to drive slowly, even slow vehicles like Skiff overtake him, Thomas passes Connor and smiles sheepishly, with Annie saying to Thomas that he is so impressive and then she, Clarabel and Thomas start laughing at Connor, but Thomas' laugh quickly turns into a worry and tells Annie and Clarabel that it is not funny as they need Connor to go back into being his normal self again. Annie and Clarabel agree this time, but as Clarabel says that Connor's racing days are probably over, an idea flies into Thomas' funnel.
Connor puffs slowly into Ulfstead Castle, he is very pleased with himself, but the passengers are not happy and remark that it is a terrible railway, Thomas then pulls into the castle station and tells Connor that he thinks he might be up for a challenge, which Connor tells Thomas that he is always ready for a challenge, Thomas says to Connor let's have a race, but Connor starts worrying about his coupling rod loosening again and having an accident and tries to make an excuse of not being able to race, but Thomas tells Connor that he means racing against Stephen, who then puffs up and begins the race, but as the race starts, Stephen starts very slowly, but acts as if he is going faster, and while Stephen begins to move, Connor stays and does not move from the platform, but then suddenly snaps and tells Stephen that he is much too faster than him, though Stephen has already chuffed around a loop back to the station, then he tells Connor about his days in the Rainhill Trials and how the engines he competed against had their parts snap off and some would even explode causing Connor to feel a bit frightened.
Thomas Friends season 20: https://www.youtube.com/watch?v=DQdY5MFcFTQ&list=PLJywQe9Uxb8tWGAq80iCfKY1sep7tsLRd
Thomas Big world Big adventures: https://www.youtube.com/watch?v=FSWFGFm9g4g&list=PLJywQe9Uxb8t3rTNeYALxJfDQia5ZCaHr