Modeling ATTX 75' Flats for Ag Products

[photogeek88]

So, I was over at my local hobby supplier the other day and picked up a circa 1990 Walthers kit for a 75' Piggyback Flat Car (Type F39 I believe) painted for TTX. I bought it since I haven't seen a kit like this for a while, it was only $8, and it was listed as 'modern' for 1990, around the era I'm modeling the C&NW. It didn't hit me until after I got home that with only 75', you sure aren't going to be TOFC-ing anything longer than 35'. So I did a little research, and came up with the fact that they may have still been used for transporting tractors and other agricultural products in later days, lettered for ATTX. Does anyone know of any photos of these cars being used for such? I've seen a bunch of 89-foot standard-issue TTX flats in pictures carrying Deere products, as well as 60' Flats lettered for ATTX proper, but none of the 75s. Also, if anyone can come up with a top view of the cars, it would be greatly appreciated. I can't tell if the deck would normally be the painted yellow metal the same as the carbody, or if it would be a wood deck - there is some corrugation on the top of the model, and seems highly doubtful of it all actually being just yellow. Thanks!