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About this blog

I'm mulling over a supplement to my GWR locomotive development book.
New sketches I prepare will appear here (in small size).  Comments and corrections on the original (be nice!) and suggestions for content in the supplement welcome.
 

If you are planning a model of any of the locomotives featured in this blog you are very welcome to contact me and I'll see if there's anything I can do to assist you in researching for your model. 

 

https://www.pen-and-sword.co.uk/An-Introduction-to-Great-Western-Locomotive-Development-Hardback/p/14507

 

 

 

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Boilers with flue tubes but no superheater elements.

From 1925 the GWR fitted a pair of 5 1/8 diameter flue tubes in the upper corners of untapered boilers that had belpaire fireboxes, pressure 165psi and above and no superheater. This is reckoned to have reduced cracking in the corners of the firebox. Tapered boilers like the 94xx never had this feature, but it was seen on all post 1934 designs and also on replacement boilers on smaller pre group pannier tanks and side tanks like 850s, 2021s and I think 517s. Did any other lines use this design f
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