Here is what I have found on the web about the GTW Phase 4 EMD F3
GTW 9027
https://www.thedieselshop.us/Data%20EMD%20F5.HTML
GTW 9027 and GTW 9023
http://www.rrpicturearchives.n...ture.aspx?id=2087629
http://www.rrpicturearchives.n...ture.aspx?id=2087628
Grand Trunk Western diesel roster
https://www.thedieselshop.us/GTW.HTML
GTW 9016-9027 were built in September 1948
Andrew