Cutaways from the 1920s (1920 to 1929).
Elevator-style car parks were still quite a novelty when this cutaway was published in 1920.
The garage shown could hold 6x the number of cars that a comparable, ordinary garage could hold.
This garage was basically all elevators: 42 elevators that retained the cars during the stay rather than off-loading them. Each elevat0r could hold 7 cars, for a total of 294 cars per garage.
Source: Popular Science Monthly February 1920
It was a fairly accurate prediction, in 1920, of the difference between the bulky locomotive of the day vs. the predicted streamlined version.
The article claimed that more locomotives had been built in the last 15 years than in all of history–perhaps true.
It was also claimed that, by streamlining the locomotive and cutting down on wind resistance, it could achieve speeds of up to 150 mph.
Click to Enlarge to 912 x 205 px
Source: Popular Science Monthly February 1920