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@BradFish1 posted:

If you upgrade a PS2 loco what enhancements do you get from a proto 3 upgrade kit?

Not enough to justify the expense!  You can use PS/3 sound files, but that's of limited utility.  You can get the quilling whistle, however most stuff is the same as PS/2 for steam.  The PS3/2 Stacker board is really a replacement for the PS/2 boards, they just used it for the steam upgrades since the PS/2 boards are no longer in production.

Diesel upgrades are another matter, you get full PS/3 diesel functionality.

@BradFish1 posted:

Thank John. I assume it doesn't get rid of the unsightly PS2 tether either.

Nope, it's part of the upgrade kit.  In truth, the PS/3 steam upgrade uses the exact same wiring harness as the PS/2 steam upgrade kit used.  They basically just slipped the PS3/2 stacker board in the kit in place of the PS/2 3V board that used to be in the kit.

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