Capsule Blue Bill and Ben, Harvey, Alfie & Bertie???

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I noticed these Capsule Bill & Bens which are blue, is this from a particular Thomas story? They look strange.



There is also Bertie, Harvey and Alfie all dressed up as Thomas.

Yep, these are based on the episode, "Bill or Ben?" in which one of the twins is painted blue to prevent them from playing tricks on new engines, such as Connor, who don't know there are two of them. Both ended up repainted after the other one tricked Kevin into doing so while Victor was away.
They went back to their original liveries in any future appearances.

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Many thanks for the story info Miks

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There is also Bertie, Harvey and Alfie all dressed up as Thomas.

Any character dressed up as Thomas like that is from the visual gags in "You Can Only Be You" from The Great Race. There's also Captain and Stephen.

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Thank you Mik

np my guy