SFEX 4204 was an MLW C-424 purchased from Canadian Pacific. It was originally CP 4204, built in March 1965 by the Montreal Locomotive Works. It worked for CP for many years until it was acquired by the Ottawa Central Railway. It went to IRSI in Moncton on May 2 2004. It stayed there all summer and finally left in early November, lettered SFEX.
4204 has an alternator from a retired CP 4500 series C630 or M630. It was shipped to the DRS shops in Nova Scotia in January 2007 for electrical work.
In 2011 SFEX 4204 went to Allied Services in Chicago, IL. In early 2012 it went to the Morristown and Erie Railway, a shortline railroad in New Jersey. It’s not clear whether it was used in service or for parts. In late 2015 it was spotted in the railway’s dead line.