Dave,

I believe Ian Cranstone developed this extensive CPR freight car roster list from studying the CPR entries in 88 issues of ORER from 1901 to  2006.

Here is the link to the CPR freight car roster for those who want to explore the data, including all the renumbering over the years.

   http://www.nakina.net/cp/cp.html

Hope this helps.

John Riddell