- “Listen to me. There is nothing wrong with that tunnel. You stuck in it, because you tried to do rock and roll. Tunnels are not dance floors, and you are not a pop star! If it happens again, I shall find ways to cut you down to size. In other words, your career is, uh.. *ahem* 'on the line.' Need I say more?”
- ―Sir Topham Hatt scolding Duncan
Meanwhile, Peter Sam is depressed, as he is still getting over his accident with the slate trucks and his cracked funnel, and wants to start work again. The Fat Controller tells him to take another day's rest and that he has surprise for him, which turns out to be Skarloey. Peter Sam welcomes Skarloey back home and tells him of a rude, rough, rocking and rolling engine called Duncan who has arrived to the railway. Skarloey's driver then approaches him, as Duncan has just got stuck in Rheneas Tunnel.
Skarloey enjoys the journey and arrives to find a very cross Duncan at the very end of the tunnel. Duncan is complaining about the tunnel to his driver, who is cross of him doing Rock 'n' Roll in the tunnel which got him stuck in it. After Skarloey leaves some workmen behind to fix the tunnel, he helps Duncan back home.
That evening, the Fat Controller reprimands Duncan and explains that the tunnel has never had problems and that he got stuck in it because he was rocking and rolling. He then threatens to cut him down to size should he misbehave again. Despite being a joke, the threat is good enough to make Duncan behave better.
- Peter Sam
- Sir Topham Hatt
- Thomas (cameo)
- Duke (cameo)
- Troublesome Trucks (cameos)
- Farmer Trotter (cameo)
- Skarloey Engine Sheds
- Crovan's Gate
- Mountainside Runby
- Valley View
- Forest Runby
- Rheneas Tunnel
- Skarloey Bridge
- Going by production order, this is the tenth episode of the fourth series.
- Pre-filmed footage from Rock 'n' Roll is used.
- On the early UK releases of Rock 'n' Roll and other Stories, the exchanged lines between Skarloey and Peter Sam, "'Who is Duncan?' 'He came as a spare engine after my accident,' replied Peter Sam, and 'Is he useful?'" are heard early and the music is omitted.
- This was one of the few episodes in the US dub that refers to a brake van as a caboose, its American term.
- In a deleted scene when the Fat Controller scolds Duncan, he wears a different surprised face mask.
- When Skarloey says "I understand," his face moves.
- When Skarloey puffs out of Crovan's Gate, his wheels are moving faster than he is and he has Duncan's whistle sound.
- When Skarloey starts away with the works train, he is missing his eyebrows.
- When Skarloey pushes behind Duncan's train, he has Duke's whistle sound.
- As Skarloey comes up behind Duncan's train, there is a spot of light above the brake van in the tunnel.
- In the US version, when Peter Sam tells Skarloey about Duncan, he mentions "his drivers" instead of "his driver" even though engines only need one driver.
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