Some context Imran Brad and Castle even Rosie came from the extended railway series something that's been untouched by the fandom till now and attempted way to continue Wilbert/Christopher Audrey's story the stories are taken from that.
I'm pretty sure that diesel who took the Express after Gordon is Wendell the Works Diesel. He works at Crovan's Gate and we see Sir Handel with Peter Sam pulling coaches in the background, and in the RWS only at CG does NWR and Skarloey cross over. So it wouldn't be that far for Wendell to go from the Works and finish the run to Barrow.
Some context Imran Brad and Castle even Rosie came from the extended railway series something that's been untouched by the fandom till now and attempted way to continue Wilbert/Christopher Audrey's story the stories are taken from that.
you can see more of Brad and castle in other express like the gravy train and forethought. and Evan the private engine. As well Edward's branch line.
I'm pretty sure that diesel who took the Express after Gordon is Wendell the Works Diesel. He works at Crovan's Gate and we see Sir Handel with Peter Sam pulling coaches in the background, and in the RWS only at CG does NWR and Skarloey cross over. So it wouldn't be that far for Wendell to go from the Works and finish the run to Barrow.