The P70 class passenger cars were the PRR's first heavyweight, all-steel coaches. They were built between 1907 and 1929, totaling more than 1,000. They were 80' long (measured from diaphragm to diaphragm), 9'10" wide, and stood 14' tall. The "70" in the class name indicates the length of the passenger compartment, proper. Their empty weight was 113,000 pounds. The cars had enclosed vestibules. Opposite corners of the car had a men's room and a women's room. Each benchseat had a window. There are ten pairs of windows, with one single, stand-alone window at each end on each side. Most seats faced from the A end to the B end; three benchseats were oppositely-faced. There were 22 benchseats on each side of the aisle, with each benchseat having enough space for two passengers, thus making up the maximum total of 88 passengers per car. Note that in 1926 they were modified to only hold 80 seats total. Later modified cars will not have the stand-alone window on the right-hand side of the car.