Z1a Class

[NW Mailing List]

Sir,
 I am not sure if this enquiry is aimed at historical N&W or modelling.
I am a member of the N&W Historical Society and at present I am trying to find the number of the loco of the class  of Z1a's that lasted the longest before either scrapping or rebuilding with piston valve low pressure cylinders, so I can put the "best fit" number on a brass HO scale Z1a model.  I am hoping at least one retained its slide valves into the late forties or early fifties! Being in the UK I am some-what out of the loop when it comes to research. I have at least 6 books on the N&W including N&W Giant of Steam by Jeffries, but the above information has eluded me.
  Can any-one help?
Thanks and regards,
    Fred Bailey.
PS I am the engineer for a new build full size atlantic locomotive being built at the Bluebell Railway in Sussex in the UK. Here is a link to our part of the web site if any-one is interested.

http://www.bluebell-railway.co.uk/bluebell/locos/atlantic/latest.html
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