Doing a little research for photos of coaches that were pulled by this famous locomotive. Anyone have any idea for coaches for this loco and time period?

From the few photos i've found it looks like 60 feet would be the correct length for these period pieces. Would the bachmann spectrum 60 foot steel coaches be a good match? I know they're out of production but i've seen quite a few still new in box on ebay including 3 piece sets and individual coaches, baggage, diner and observation.

72' and especially 85' definitely don't seem like they would look right and the 40' seem way too short.