Duncan's Boiler Sludge

Duncan's Boiler Sludge is an upcoming episode.

Characters

 * Thomas
 * James
 * Rheneas
 * Rusty
 * Duncan
 * Freddie
 * Mighty Mac
 * Mr. Percival
 * Skarloey (cameo)
 * Sir Handel (cameo)
 * Peter Sam (cameo)
 * Luke (cameo)
 * Millie (cameo)
 * Owen (cameo)
 * Merrick (cameo)

Trivia

 * This episode marked the first of two things:
 * The first episode to have James as part of the narrow gauge engines since the eleventh season.
 * The first episode where Millie, Fearless Freddie and Mighty Mac work at the Blue Mountain Quarry.