Thanks for all the responses. You guys make a very good argument for the FM Erie-builts, but it is not my favorite engine. I do love it as another example of the Milwaukee Road's individuality though. I have to have them in the traditional orange and black paint schemes too. I was leaning toward the 3rd Rail E 7's, but traditional F units would be easier and seem more right to be for some reason. I do have the Golden Gate passenger cars on order for this train.
Tom, it sounds like I can use just about anything that looks correct to me. I will overlook your southern California bias as it is a Santa Fe one that I also love. We didn't make the trip on the transfer of the Milwaukee dome car to the Twin Cities, but appreciate your heads up on it.
Art