A reprint of a locomotive construction article from a Canadian National house publication, linked from Railway Preservation News:
http://www.trainweb.org/j.dimech/6167/np.html
Also a Canadian National roster; note the 10 engines numbered 4200-4209. These are USRA light 2-10-2s (which Bachmann offers, of course), originally built for the New York Central (Boston & Albany), and sold after about 10 years or so to CN, perhaps because they weren't fast enough on a road like the NYC:
http://www.angelfire.com/ca/TORONTO/CNRsteam.html
Have fun.