Bill or Ben?

"He must be very full of himself!"

- Ben referring to Connor

Bill or Ben? is the fifteenth episode of the seventeenth season.

Plot
One day, while puffing along the mainline, a big and fast engine Bill and Ben have never seen before pulls onto their track at a junction. Further along the line, Bill and Ben meet Thomas who tells them that the streamlined engine was Connor. The twins think that Connor must full of himself, racing around and surprising other engine. Thomas tries to explain that Connor is friendly, but the twins will not listen.

Sometime later, the twins pass through Henry's tunnel when they get surprised by Connor again. Bill is still inside the tunnel as Connor passes and whistles hello to Ben. The twins decide to play a trick on Connor.

The next time Connor comes to Sodor, Bill is waiting for him. Bill challenges Connor to race, but the big streamlined engine does not think it would be fair to race against such a small tank engine. Eventually, Connor agrees and when the signal turns green, they both race off towards Ulfstead Castle. Bill is soon left far behind and Connor thinks he has won. Connor gets a massive shock when he pulls into Ulfstead Castle and sees Ben waiting at the platform. Connor falls for the twins plan and thinks it is Bill who has beaten him to the castle. Ben suggests that they have a rematch and race back to the bridge. Connor agrees and the race soon starts.

This time, Connor takes no chances and focuses solely on beating the little tank engine. He concentrates on the race so hard that he runs through a red signal and nearly causes a serious accident with Henry. Connor's relief is short-lived as the Fat Controller pulls up in Winston. He is very cross with Connor for missing the red signal. Just then, the twins both pull up and Connor realises that he was being tricked all along. The Fat Controller is not amused with Bill and Ben's antics and orders Bill to be repainted so that they cannot be confused so easily.

At the Sodor Steamworks, Bill tries to get out of being repainted but Victor has been pre-warned about the twins' tricky ways. Shortly, Bill has a brand new dark blue livery.

Back at the shunting yard, Ben laughs when he sees his twin. Bill is not happy; now that he looks the same as his twin, it's no fun at all. Then, Ben has a crafty idea and heads off to the Steamworks himself. When he arrives, Victor is not there and Ben tells Kevin that he is Bill and has come to be repainted in accordance with Sir Topham Hatt's orders. Kevin is unsure as he thinks Bill was repainted yesterday, but when Ben threatens to involve the Fat Controller, Kevin agrees to let Ben be repainted. Soon Ben has been coloured exactly the same colour as Bill. Victor arrives and is not happy, but there is nothing he can do; the job has already been done.

Bill and Ben, now both painted dark blue, are on their way again when they see Connor up ahead. The twins decide to play another trick on him. Bill challenges Connor to another race. Connor, thinking that now the twins are different colours he will be able to tell them apart, agrees. Connor thinks he will definitely win, but Bill is not so sure!

Characters

 * Thomas
 * Henry
 * Bill and Ben
 * Connor
 * Victor
 * Kevin
 * Sir Topham Hatt
 * Rosie (cameo)
 * Winston (cameo)
 * The Teacher (cameo)
 * The Bird Watcher (cameo)
 * One of Dowager Hatt's Friend (cameo)

Locations

 * Ulfstead Castle
 * Sodor Steamworks
 * Henry's Tunnel
 * Vicarstown Bridge
 * Shunting Yards

Trivia

 * This episode seems to have been adapted from the magazine story, Diesel's Race and the second season episode, The Diseasel.

Goofs

 * Henry's brakevan changes between shots.
 * How did Connor and the workmen not notice Bill and Ben's nameplates?
 * During the second race, Connor was travelling much too fast to stop before hitting Henry.
 * When Connor screeches to a stop, his bogie wheels and trailing wheels spark, but neither are fitted with brakes.
 * The workmen forgot to scrape off Bill's original paint work when they're about to repaint him.