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GWR 1813 Class



The 1813 Class is intriguing. They started off as side tanks, and ended up as pannier tanks with saddle tanks fitted in between. The side tanks didn't last very long, and this was a period where there were any number of experiments with boilers. Consequently there is extraordinary variety, and it seems as if not only were there no two the same, but none of them stayed the same for very long either. These sketches are the fruits of a small joint research exercise with @Mikkel.
Beware of thinking either of these sketches is representative of any locomotive at any date! They are all features that existed (along with quite a few others) but I haven't attempted to align these versions of the sketches to any particular one of the photographs and drawings we found.






There is a sketch of this class in the published volume, but it was rather basic. I wasn't satisfied with it (are we ever completely satisfied with any model, whether in electrons or in brass?), but I felt it was a vital one to include, since these side tanks were the direct ancestors of the 57xx and 94xx classes.


Edited by JimC
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Good to see you posting your drawings here Jim, a real treat!


I'm still undecided whether to do the earlier or later variant of these, but now have the number plates for both! You know, like the would-be author who has the title for his book but hasn't written it yet :)

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I don't suppose anyone here has a copy of diagram C or something else in the way of works drawings for the 1813s as saddle tanks? I drew pannier tank variants for the book, and the side tanks above, but I don't have anything for the stage inbetween, which seems something of an oversight. NRM has a copy, but while I don't mind paying their reproduction price for a full GA, it seems an awful lot for the minimal info on a weight diagram.

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No drawing, but here's 1815 posing c 1905 according to RCTS. It has an original length, 3-segment, tank. 'Admiralty' rods.



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RCTS reckons that saddle tanks were common with the 1854s, so that provides a starting point. 

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Posted (edited)

I've been sent a copy of Diag C, so I'm covered:-)

Yes, as far as I can see once the original boilers were gone the pitch was 6'11.75. RCTS doesn't document the handful with domed boilers and side tanks, but they look as if they are higher pitched than the originals to me, and so I drew it at the higher figure. 

I think the 1813s would be a R2R manufacturers nightmare. I suppose the fact that none lasted long enough to receive BR livery would be a major killer anyway, but you can permutate forward dome, back dome and domeless boilers, round top and belpaire fireboxes, side tanks, five panel and three panel saddle tanks, short pannier tanks, full length pannier tanks, various bunkers, narrow, standard width and enclosed cabs, top feed or not, superheating or not, but of course all GWR locomotives look the same...

Edited by JimC
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