Bill
I agree this variation should be added to our ‘step box’ discussion as one the MP used. Having never seen a yellow top I erroneously thought the ad showing one in service was just the whim of the artist. Having been to numerous RR antique shows the last 40 years all I saw were the silver ones. Rereading this thread Bert Dockall mentions the Pullman step boxes were silver tops with yellow bottoms so perhaps the MP ‘borrowed’ the idea from seeing the Pullman versions and just reversed the color scheme. Looking again at the Timken ad I don’t recall seeing Amtrak passengers dressed like that last time I took the train. 
