Any order

[AndyJB]

To have an easy instal I'm about to throw Thomas's DCC sound decoder into one of the girls and permanently couple them together.  Do they run in any particular order i.e. does Annie always run directly behind Thomas or is it Clarabel? I might as well make it prototypical

[ShadowMonk]

Annie then Clarabel.

Annie looks in the same direction as Thomas (Looking at Thomas' back), whilst Clarabel faces the other direction.

[AndyJB]

Thank you, I would have missed the Clarabel direction part.

[Fergusfan17]

Any other questions?

[AndyJB]

Any other questions?

Yes.
I am not expecting to but if I have trouble fitting the decoder and speaker in Diesel what rolling stock could I couple to him?

[Fergusfan17]

Hmmmmm,
Maybe like an um like um like a freight car???
Sorry, he's a hard one