Scruff/Salty

Cast

 * Scruff as Salty (Scruff and Salty's names both start with "S")
 * Oliver as Stanley
 * Peter Sam as BoCo (Peter Sam and BoCo are both green)
 * Hank as Mallard (from RWS) (Hank and Mallard are both blue tender engines)
 * Diesel as Spencer
 * Duck as Charlie
 * Kevin as Hiro
 * Percy as Skarloey
 * Den as Den
 * Dart as Dart
 * Edward as Oliver
 * James as D261
 * Bash as Arry
 * Dash as Bert
 * Hiro as Henry (Hiro and Henry's names both start with "H")
 * Caroline as Mavis
 * Lady as Daisy
 * Rheneas as Rusty (Rheneas and Rusty's names both start with "R")
 * Flora as Elizabeth
 * Stanley as Billy
 * Derek as Thomas
 * Charlie as Butch
 * Splatter as Bill
 * Dodge as Ben
 * Rusty as Trevor
 * Victor as Duck
 * Stepney as Oliver
 * Dennis as Gordon
 * Henry as Harvey
 * Fergus as Victor
 * George as Smudger
 * Freddie as Proteus
 * Duke as Bertram
 * Magnus and Myggen (a made-up engine) as Bash & Dash
 * Whiff as Hank
 * Mavis as Madge
 * The Spiteful Breakvan as Norman
 * Arry as Sidney
 * Bert as Paxton
 * Skipper (from Skipper & Skeeto) as Edward
 * Molly Mouse (from Skipper & Skeeto) as Molly
 * Billy as Oliver (Pack)
 * Doc (from The Little Engine That Could) as Fergus
 * Paxton as Ned
 * Salty as Ferdinand
 * Farnsworth (from The Little Engine That Could) as Lord Harry (from RWS)
 * Judge Judy the Diesel as Emily
 * Duncan as Godred (from RWS)
 * Pete (from The Little Engine That Could) as Bear (from RWS)
 * The Big City Engine (from RWS) as Spamcan (from RWS)
 * Daisy as Lady
 * Big Mickey (from TUGS) as Colin
 * Sixteen (from RWS) as Monty
 * Fungy Frog (from Skipper & Skeeto) as Sir Topham Hatt
 * Lizzie Bee (from Skipper & Skeeto) as Lady Hatt
 * Budgie (from Budgie the Little Helicopter) as Jeremy
 * Belle as Caroline
 * Bulstrode as Duncan
 * Smudger as Bulgy
 * Madge as Flora
 * Bertie as Stepney
 * Molly and Milly (made up characters) as Henrietta and Old Slow Coach
 * Theodore (from Theodore Tugboat) as Ivo Hugh (from RWS)
 * Hank (from Theodore Tugboat) as Scruff
 * Truro (from Theodore Tugboat) as Neville
 * Northumberland (from Theodore Tugboat) as Terence
 * Zip (from TUGS) as The Spiteful Breakvan
 * Zug (from TUGS) as Scruffey
 * Digby (from Theodore Tugboat) as Toby
 * George (from Theodore Tugboat) as Jock (from RWS)
 * Foduck (from Theodore Tugboat) as Toad
 * Emily (from Theodore Tugboat) as Belle
 * Guysborough (from Theodore Tugboat) as Sir Handel
 * Fundy (from Theodore Tugboat) as Bertie
 * Arthur as Albert (from RWS)
 * Thomas as Alfie
 * Sir Handel as Frank (from RWS)
 * Spamcan (from RWS) as Diesel
 * Diesel 10 as Max
 * Hamlet (A made up character) as Lorry 1
 * Leah (A made up character) as Annie
 * Terence as Buster
 * Rosie as Isobella
 * Fire Chief (from TUGS) as City of Truro
 * Georgia (from The Little Engine That Could) as Clarabel
 * Bill as Mighty
 * Ben as Mac
 * Ivo Hugh (from RWS) as Derek
 * Gordon as Arthur
 * Skarloey as James
 * Toby as Peter Sam
 * Harvey as Percy