Nice work! That screaming sound is my childhood, I grew up with the screaming WH 1447J on the Q in the dinosaur age when R68/A Q trains were a thing.
I'm trying to install this pack, I dropped the motor sounds into the directory (and told Windows to replace files when prompted) and deleted the old motor code in TRAIN.DAT and threw in the old one (of course, after wisely making a backup). It still sounds the same, are we supposed to add the MOTOR_P(x)/MOTOR_B(x) code or replace it?