Re: PRR X28 Handbrakes
I believe the same can be said for the B&O ARA box cars. Their class M-26d and M-26e received AJAX powered hand brake as built. The earlier classes M-26, M-26a, M-26b and M-26c all retained their vertical shaft hand brakes even for cars being refurbished at the Washington Indiana shops in the mid-1960s for the loading of class A cargo.
The class M-27 cars are more complicated with the many re-buildings some did receive AJAX powered hand brakes.