A Most Singular Engine

A Most Singular Engine is the second episode of the twenty-first season.

Plot
Diesel makes mischief between Daisy and Harvey by telling them both that the other is boasting of being unique. However, the two become friends while assisting each other on a job, and Diesel does not understand why.

Characters

 * Thomas
 * Percy
 * Harvey
 * Ryan
 * Diesel
 * Daisy
 * Skiff (does not speak)
 * Duck (cameo)
 * Sidney (cameo)
 * Paxton (cameo)
 * Bertie (cameo)
 * Mr. Bubbles (cameo)
 * The Teacher (cameo)
 * The Great Composer (cameo)
 * The Welsh Bird Watcher (cameo)
 * Captain Joe (cameo)

Locations

 * Arlesburgh West
 * Arlesburgh
 * Arlesburgh Harbour
 * Harwick
 * Knapford
 * Knapford Station Yard

UK and AUS

 * John Hasler as Thomas
 * Nigel Pilkington as Percy
 * Keith Wickham as Harvey
 * Steven Kynman as Ryan
 * Kerry Shale as Diesel
 * Tracy-Ann Oberman as Daisy

USA and CAN

 * Joseph May as Thomas
 * Christopher Ragland as Percy
 * Keith Wickham as Harvey
 * Steven Kynman as Ryan
 * Kerry Shale as Diesel
 * Tracy-Ann Oberman as Daisy

Trivia

 * A reference to the twentieth season episode, The Way She Does It is made.
 * This is the first time the North Western Railway is referred to as such in an episode and the second refrence overall.
 * Some of the instrumental music heard during the episode bares a slight resemblance to the Bill Withers song, "Lean on Me."
 * This episode marks Mr. Bubbles' first appearance in an episode since the sixteenth season episode, Muddy Matters.
 * "Eye of the Tiger" plays when Daisy and Harvey glare at each other at the level crossing. This song was previously used in the twentieth season episodes Cautious Connor and Over the Hill.

Goofs

 * When Diesel is talking to Daisy and Harvey at Arlesburgh Harbour, he is on Harvey's line, but just as he leaves, he is on Daisy's line.
 * Daisy states multiple time that she is the only diesel railcar on sodor. However, Hugo is also a diesel railcar.