Ok, I usually surf eBay for builders plates when this one popped up. It's listed as a BN plate. I look up the builders numbers when possible to give the sellers the extra info on trainweb.com. This plate came up as RDG 103 a NW2....as you know this loco is preserved so I fired off an email to them about it.
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... &rd=1&rd=1
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... &rd=1&rd=1