The O scale layout at the Museum of Science and Industry had an estimated 25 million viewers during it's 60 years of running, 1941-2001. The layout influenced many to become model train hobbyists. The "Museum & Santa Fe Railway" was built and sponsored by the Santa Fe ...which would up date the layout with the contemporary trains running on the real railroad. Steam engines and heavy weight passenger cars gave way to diesels and streamlined passenger cars . When Amtrack took over ...only Santa Fe freight cars were found rolling on the layout . Layout was rebuilt in 1953 ,1988 . .and removed in 2001 with many pieces sold off via eBay.
3 diesels were sold off in a lot ...this engine a Central Locomotive Works SD45 from the 1980-90's shows signs of many years & miles of circling the layout .
The control tower was installed on the MSI layout in 1953 and the freight station in 1965 when the piggyback yard was added
Please see link for video of MSI engine running ...it is loud due to worn gear boxes
https://youtu.be/ITu9roWCwL0
To see video of layout taken from the balcony in 1992 please see