Boeing 767-400

Yes see Boeing URL

I seem to recall Boeing starting to produce a 767-400 in the mid to late 90s on the back of an order from Delta A/L. Did this model ever go into production and did any other airlines buy them. How many were built

Yes see Boeing URL http://www.boeing.com/commercial/767family/background.html

From Wikipedia, therefore accuracy cannot be verified:

As of November 2010, 38 Boeing 767-400ERs have been delivered, with 16 to Continental Airlines and 21 to Delta Air Lines. A total of 37 of this variant were in airline service as of July 2010.

You mean the “767-400” of which Google holds a wealth of information?

http://www.google.co.uk/search?sourceid=chrome&ie=UTF-8&q=boeing+767-400