Question: Pro Street cars are built similar to what class of car that is described as "all motor"?
Sentence (from "Hedley Hi-V (New York City Subway car)"): They were also the last high voltage cars built for the system as all subway cars delivered afterward had low voltage since high voltage cars were a hazard to both the train operators and track crews, which is probably one of a few reasons why the TA was in a rush to get rid of these cars by the mid 1950s with the R17, R21, and R22 cars.
Relevant evidence: No