The CB&Q open-platform cars Denny mentions have an interesting history. Some of the cars seen are actually stretched wood cars (the cars with the longer wheelbase trucks) that had been steel sheathed in 1926. As the conversion program got underway an official asked to look at the costs associated with the project and determined that applying new steel underframe/platforms and rebuilding worn-out wood bodies to fit was not economical and ordered the program shut down. The Bettendorf steel underframes on hand were instead applied to brand new steel bodies and new trucks. The open platforms were retained until the all steel cars in the commuter fleet were upgraded with closed vestibules, remodeled interiors and air conditioning. This was in conjunction with the arrival of the Budd stainless steel gallery bilevel cars in 1949-50 which also included building power cars for train lighting and air conditioning on the heavyweight cars. The gallery cars had Waukesha propane A/C. The steel sheathed cars went into work train service and lasted through the 1960s. Charlie Vlk