The "Museum and Santa Fe Railroad" an O scale miniature train layout ran at the Chicago Museum of Science and Industry 1941-2001.
Minton Cronkhite and crew did the initial building of the layout and provided the rolling stock in Q gauge paid for by the Santa Fe Railroad.
1948 Santa Fe wished to update the layout with more modern equipment hiring Bob Smith ( CLW ,Central Locomotive Works) of Chicago to build Alco PA diesels and matching passenger cars .
Bob Smith in 1953 would update the layout to O gauge 1 1/4" gauge and continue to supply new rolling stock for many years to come EMD FT's ,F3's, Baldwin center cab, GM switchers , SD45's etc.
Pictured are a set of CLW PA's pulling Exacta cars all 17/64ths scale .
This train would be replaced in the 1960's with more modern equipment.
Please see link for video of train running
Cheers Carey