Maybe I'm just not looking in the right place but are there any external differences between these two SD's?
According to 'wikipedia' there is no external difference between carbodies. (and we all know that if it's on the internet it must be true! lol!)
There were probably many internal upgrades and such but it didn't seem to affect the outside much. I just spent some quality trackside time by NS and if it wasn't for the model designations below the cab number, I would have been lost.
Thanks,
AF