"My name is Victoria…
Victoria, the oldest of the underground trains, is a warm-hearted, motherly figure. She is a great storyteller and often entertains the younger trains with tales of bygone days."
Victoria Works Beside Bakerloo (The Sherlock Holms Of The Underground) Hamersmith And City (The Twins), Jubilee (He Loves Technology)  And Circle (The Hippy Chick)
 

Underground Ernie

"Bakerloo’s the name…
The Sherlock Holmes of the underground, Bakerloo’s attention to detail is legendary and he has been known to help Ernie out of the trickiest situations. One of life's great eccentric characters."
Bakerloo Works Beside Victoria (The Grandmother Of The Underground), Hamersmith And City (The Twins), Jubilee (He Loves Technology)  And Circle (The Hippy Chick)  

"Hi, I'm Ernie! I'm A Jolly, Kind-hearted Man. In Each Episode I Face A Problem, Which I Need To Fix. The Trains, The Public And The Children All Know They Can Rely On Me, As I Come From A Long Line Of Underground Supervisors"
Ernie Works Beside Millie And Mr. Rails (Mr. Rails Never Fails)
Ernie's Trains Are Victoria (The Grandmother Of The Underground), Bakerloo (The Sherlock Holms Of The Underground) Hamersmith And City (The Twins), Jubilee (He Loves Technology)  And Circle (The Hippy Chick) 

Frida Is a German shepard, she is Spock's Older and caring Sister. She Is 21 Years Old and She's described to have a heart of gold, 
She identifies as Pansexual 
her personality is described as outgoing kind caring and cheeky. She has black fur purple eyes and taller than spock, she shares the same abilities as spock, both strength and speed