I actually would leave Wild nor's sim of Bert up as there is no AR livery equivilent of him in his rebuilt form due to artist error. Anoyingly it is actually true there is no mention of him getting a larger boiler after his enclosed cab and taller chimney mods as such but I would take it as an unoffical given that he has it not just because of the strong parallers of the two railways but the mention of Bert becoming a narrow gauge engine in his own right rather than his former scaled down self. In the final line of his IoS bio its mentioned he is now as free steaming as Rex. This would seem to imply a larger boiler and the AR would no doubt be motivated by River Irt's improved preformance.
Bert was not modified before River Irt as Irt got his taller chimney, Kylchap blast pipe, tall dome and enlarged cab in 1972 ( I think anyway but the list on that link doesn't mention the blast pipe ), where as Bert's gained his Kylchap blastpipe and taller funnel a year later ( IoS ). River Irt was given a larger boiler in 1977 ( I presume at the end of the season but i've not been able to confirm this ). Bert's unmentioned boiler and dome are the only bits that are speculation, along with the date of his mentioned enlarged cab but I havel little doubt Wilbert Awdry intended him to keep up with his 'brother's' improvements. Going on Jock's book he was re-tubed for the start of the 77 season, but thats all we know. Given IoS was released in 87 I think its safe to unspeculativly say that he got a larger boiler, tall dome and cab before then, bringing him in line with Rex and Mike.
I'm never quite sure how to put these arkward facts on a wiki page without scrutiny but if someone wants to reword that then be my guest.
"I think its safe to unspeculativly say that he got a larger boiler before then, bringing him in line with Rex and Mike." I can't see how you'd come to this conclusion? What do we have to base on that he got a "larger boiler"?
Its akward to say as a fact because its presumtion of the wording of his bio and River Irt's history, but to quote
"Bert's appearance is now different from that shown in SRE/21. His taller chimney, with cab enlarged to match, has turned him into a Narrow Gauge Engine in his own right instead of, as formally, a scaled down version of a standard gauge locomotive.
Bert is now as powerful and free steaming as Rex, but is more 'sure footed' and in addition gives his driver a smoother ride."
The unspecified larger boiler would allow him to be on par with Rex/Esk and complete his transition into a flull blown narrow guage loco.
I can't argue my case better than this i'm afraid with the information that is available but i'm sure its implied.
I won't carry on my argument as I have no other amunition but I would like to point out there are other things that are unstated yet taken for granted such as Rex becomming articulated when he was sent to the Yorkshire Engine Co for rebuilding and that later on his hypothetical former steam tender's chassis went into the construction of Mike. My point is Awdry kept these engines in very close parallel and that if River Irt was enhanced with a largr boiler mod to rasie him up with the other steam mainstays of the RE&R i'm sure the AR would of followed in their wake. Its a great shame IoS was trimmed down to be released for its retail price as we might of had a more certain answers today. Oh well
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