Nearly two years ago I got a great deal on a PS1 C&O Allegheny. Having successfully done 6 or so PS1>PS2 upgrades I decided to do a PS3 upgrade with hopes of using a quilling sound set. Finally during time off near Christmas I completed most of the upgrade. Unlike previous upgrades, the articulated Allegheny presented unique challenges. First off the motor is huge so I had to modify the tach reader so it wouldn't scrape the tach tape on flywheel. MTH upgrade documentation photos are in black and white which isn't helpful when the color of wires is really important. Opening and closing a 20+ pound model without pinching wires was tricky. I tested once I had the PS3 board installed. I didn't get sound from the speaker but forward and reverse worked. I had to reverse how I had soldered the motor wires to get engine to start in forward.
In an effort to get speaker working I must have crossed a wire. Next test I noticed smoke from the PS3 board and quickly shut off power. Despite detaching speaker I feel the board was gone since the engine was no longer recognized by DCS. So now I'm configuring a PS2 board from a old Railking donor engine. I've been able to successfully run the engine using a tender from my PS2 upgraded C&O Greenbrier. I'm super pleased to own and operate a scale Allegheny on my min O-54 curve layout. I've visited both of the last remaining Alleghenys (the 1601 in Detroit and the 1604 in Baltimore). My avatar is a pic of me in the cab of the 1601 with my hand on the throttle. While not the same thrill as the real thing I'm enjoying controlling a big O scale model.