Air date: September 4th, 2014 (UK)
One day, Thomas and Diesel are sent to collect a big order of stone from Ffarquhar Quarry to Brendam Docks. Unfortunately, they are unable to agree which of them is going to be the back engine. Thomas doesn't think it should be him because it is his branch line, but Diesel insists having a revolutionary diesel on the branch line is bound to improve it.
Thomas and Diesel are still arguing when they arrive at the quarry. Mavis tells them to stop; she thinks they should think themselves lucky because she works in the quarry all the time and rarely gets to see the rest of the island. Thomas asks if Mavis would like to be her back engine, but Mavis says there is too much to do at the quarry. Thomas tells her that Diesel can look after things while she is away. Mavis thinks this is a lovely idea, but Diesel has other ideas. Diesel couples up to the back of Mavis' train and tells her that he is going to be her back engine on their trip to the docks. Mavis asks Thomas if he would mind looking after the quarry for a while. Thomas is not particularly happy with idea of staying at the quarry all day. Mavis warns Thomas to watch out for the Troublesome Trucks, but Thomas says he knows all about dealing with trucks.
Thomas sets to work at the quarry. He fills up all the empty trucks and then pushes them into line, but Mavis was right; the trucks at the quarry are extremely troublesome and do not like being moved. Thomas begins to lose patience and hopes that Mavis and Diesel return soon.
Mavis and Diesel have just arrived at the docks. Mavis loves being beside the seaside and thanks Diesel for letting her come with him. Mavis knows she needs to get back to the quarry, but Diesel spots another goods train destined for the shunting yard. Diesel tells Mavis that they could do that job together, too. Mavis reluctantly agrees.
Back at the quarry, Thomas hears an engine approach and assumes that it must be Mavis and Diesel. Unfortunately for Thomas, it is just Toby and Henrietta taking some workmen home for supper. Thomas explains that he needs to get the Troublesome Trucks to the docks and is in need of a back engine. He asks if Toby will help him, but Toby thinks there are too many trucks for him and he has his own job to do anyway. Thomas is upset, but Henrietta tells Thomas to be patient.
At the shunting yard, Mavis and Diesel have delivered the goods train. Mavis tells Diesel that she has had a great time, but she really needs to get back to the quarry. Tricky Diesel spots another goods train that they can take to Vicarstown and persuades Mavis to come with him to deliver that one, too.
Thomas is still waiting at Ffarquhar Quarry and is becoming more and more impatient. He knows that the Fat Controller will be very cross if the trucks do not get to the docks in time. Thomas thinks that pulling the trucks on his own, without a back engine, will impress the Fat Controller so sets off with the heavy train of stone trucks.
When Thomas reaches a hill, the trucks start playing their tricks. They hold Thomas back as he tries to climb the hill. When they reach the summit, they don't hold Thomas back any longer and decide to push him instead. Thomas is pushed down the hill at tremendous speed. Neither Thomas nor the brakevan are strong enough to stop the surging trucks who push Thomas towards Maithwaite station. Toby is at the platform and Thomas calls out to warn him. Luckily, a quick-thinking signalman is able to switch the points to divert Thomas onto a siding. Thomas hits the buffers hard and some of the trucks come off the rails. Just then, Mavis and Diesel pull up. Mavis is surprised to see Thomas and asks for an explanation. Thomas explains that he decided to take the trucks on his own because they had been taking so long. Diesel acts innocent and says to Thomas that he had told Mavis several times that they needed to return to the quarry. Mavis is not happy with Diesel's lying.
It's not long before the trucks are put back onto the rails. The Fat Controller reprimands Thomas for taking the trucks without a back engine. Thomas apologizes and says he was just trying to be useful.
The Fat Controller sends Mavis back to the quarry to do what she does best, but he does realize that every now and again, it's nice for Mavis to see the rest of Sodor. So, later that day, Thomas acts as Mavis' back engine as they deliver another trainload of stone to the docks. When they arrive, Mavis is so happy that she starts singing and soon everyone at the docks joins in, too.
Tropes featured in the episode:
- Animation Bump: Thomas' facial expressions are more fluid, most noticeable in the parts when he's asking Toby to be his back engine, when he's worrying the trucks won't arrive on time, and when he says "You said you were going to be good!" when the trucks start to misbehave.
- Blatant Lies:
- The trucks pretend to obey Thomas as he decides to take them without a back engine. It's not until they get to Gordon's Hill that they reveal they lied.
- When Thomas screeches to a halt at a siding in Maron Station as a result of trying to take the Troublesome Trucks to Brendam Docks by himself, Diesel tells Thomas that he told Mavis a number of times that they need to get back at the quarry (when he was really trying to keep Mavis from going back there). Mavis tries to call him out for this upon hearing it.
- Call-Back: This isn't the first time Thomas has been pushed down Gordon's Hill by a train of troublesome trucks and almost derailed at Maron.
- Continuity Nod: Diesel boasts that having a "revolutionary diesel" will improve Thomas' branch line.
- Gilligan Cut: Subverted. Henrietta tells Thomas Mavis and Diesel will be back soon, then the camera shows the clock as it goes forward one minute.
- Gullible Lemmings: Thomas rather easily believes the ever conniving trucks' word that they'll behave. Meanwhile Mavis is swayed by the equally conniving Diesel into shying from their duties at the quarry.
- Sudden Musical Ending: The episode ends with everyone singing "I Do Like to be Beside the Seaside".
