Collect airliners, but more of a 1:400 collector. Sorry.
Through Skymarks does have some nice releases close to 1:87, easy to build too....
If you like discussing model planes, here's the best place to do it; http://www.diecastaircraftforum.com/ (if ya want to look for me, just look for a...
Here's the list of cars that probaly ran the Loop and subways below it around then(cars in bold I'l probaly use, I might even complete a collection the cars, through my starters are Budd 2200s);
Cincinnati Car 4000(historic charters only)
St. Louis Car 6000/I-50
Pullman-Standard 2000
Budd...