RailPro > RailPro Specific Help & Discussion

Anyone done a P2K GP9?

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William Brillinger:
how long is this space?

G8B4Life:
I thought I had a couple of DH123D's around here but can only find the empty packets. I was going to take a size comparison shot for you but alas I could only find a TCS T4X that I still have.

The LM-3S measures 38.0mm L x 18.0mm W x 6.45mm H. RE gives you 1.50 x 0.68 x 0.25 Inches in their info. You'd need to add a little bit to the length for "wire return" as the LM has a plug at both ends.

Looking at the board in the photo it appears there is a couple of inductors on the board. I'd be wary of them, the last loco that I tried a module in that had inductors on the board the module didn't like it. Note, that's not just a RailPro thing, many DCC decoders don't like inductors either.

I know you don't want to do it this way but personally I'd toss the factory board. You'd gain a lot of space for the module and possibly a speaker like an iPhone speaker without having to do any weight surgery. You don't even have to solder wire to wire (I absolutely hate that) for hardwiring, a small piece of PCB stripboard makes a nice solder pad if there's room.

- Tim

JeffShultz:
Well, I can say confidently that it won't fit. So... It is hardwire time. Fortunately I ordered the harness to do that.
Question: does the LM-3 support LEDs directly, or will I need to add resistors?

Alan:
You will need resistors with LEDs.

gcarter1945:
If I said I did a Proto 2K GP9, then I was lying like a rug.  However, I did do a Proto 2K GP7.  The only surgery I remember performing was to cut a slot in the nose weight to make room for a modified IP4SK speaker that I bought from Bill.

Picture attached.

Geoff

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