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GP 20 - On Members Workbenches. - More Practical Help - Your Model Railway Club
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 Posted: Tue Jun 12th, 2012 11:50 am
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MaxSouthOz
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I always pick up a couple of waifs at our annual exhibition.  This year was no exception.

I picked up an Atlas GP 7 - Atlas make some of the best stuff, being ex-Kato, the worlds winner for me.

GP 7s are a dime a dozen, but an Atlas - well it was worth the A$45.00 I paid.

I'll do a thread on the GP 7 later, but the other little gem was this Proto 2000 GP 20.

Another bargain at A$45.00 - but there was a surprise inside - a 4 function motion decoder!



The EMD GP 20 is a 4 axle diesel built by General Motors Electro-Motive Division between November 1959 and April 1962.  Power was provided by an EMD 567D2 16 cylinder turbocharged engine which generated 2000 horsepower (1 hp = 746 Watts).  EMD were intially hesitant to turbocharge their 567 series diesel, but were convinced to do so after successful tests made by Union Pacific.

There were 260 of these units produced for Americal railroads.

I need to have two LEDs visible for testing once this fellow is fitted up with an ESU sound decoder.  No silly roof beacons for this baby.  Next to the herald on the nose, just above the hand rails on each side, there are two ditch lights.  On the model there are two clear plastic lenses.  Ideal for the purpose.

First to make a pair of lamps.  5000 mcd 3mm LEDs will do the trick nicely.



A 1000 Ohm resistor is soldered to the negative (short), leg of each LED.  Blue wires are attached to the positive (long), legs and purple and green wires are attached to each of the resistors.  They will attach to the purple and green wires on the decoder.

Once the LEDs are lit, black paint is applied to stop them glowing through the body.



The assemblies are installed under the hood, with the ends of the LEDs up against the backs of the lenses, and then blobs of PVA glue are moulded in to lock them in.



The PVA will dry clear overnight.  It will hold them securely once it has set up, but it can be prized loose if necessary.

More tomorrow night.



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Max
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 Posted: Tue Jun 12th, 2012 07:35 pm
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Petermac
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It's got to be a gift at $45 Max.

Was there a problem with the drive mechanism at one time with the Proto stuff ?  I seem to remember Mike C had some issues with earlier models .............

Looking forward to seeing (and hearing) what wizardry you fit into this one .......;-)



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 Posted: Tue Jun 12th, 2012 08:55 pm
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MaxSouthOz
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Yes, Peter.  The P2K have a small plastic gear in the drive axles which was prone to splitting on some models.  It's easily replaced.  You can buy the gears separate and make them up yourself, or the axle sets complete.  Athearn use the same system.

It's a small inconvenience (once you work out what's happening), the rest of the model is excellent - and they run well.

One of the members of my blog who lives in Sydney, is sending me some of his bass reflex speakers to try.  If they fit, I'll try one of them with a V 4 Loksound decoder.



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 Posted: Wed Jun 13th, 2012 07:17 am
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MaxSouthOz
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Testing the ditch lights.  I reckon they will do.






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 Posted: Thu Jun 14th, 2012 07:24 am
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MaxSouthOz
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Next job.  Cut a hatchway in the roof.



Then fit a wintering hatch I found amongst the bibs and bobs in the box.



This is going to allow the sounds to come out of my nifty little solid state speaker that Norm sent me to try.  I've already run it in the open air and it sounds excellent.



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 Posted: Thu Jun 14th, 2012 10:27 am
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gdaysydney
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Nice work Max:thumbs



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 Posted: Sat Jun 16th, 2012 09:57 am
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MaxSouthOz
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Thanks, Dave.

Here's a photo of the speaker.  Tiny, isn't it?



Here we are at the next stage.  Ready for the first test run.



Started running in on the main layout round and round.



You can see the green and purple wires for the ditch lights and the blue (+) common ready to put the body on.

After running in at speed step one, snails were passing it!

This is going to be my best rebuild yet.  Loksound Version 4 sound decoder fitted.

"I'm excited, Betty!"



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 Posted: Sun Jun 17th, 2012 09:17 am
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MaxSouthOz
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Well, the movie sound doesn't really do it justice - but it's very good.   Such a tiny speaker.

Anyway, here's some running on the rollers and some more gratuitous running shots in a lash up.

http://www.youtube.com/watch?v=UrLjTcZuYdE

 



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 Posted: Sun Jun 17th, 2012 09:35 am
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Petermac
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Brilliant vid Max - as you say, what fantastic sound.  On the stocks, I thought you managed to create some valve-bounce !!!  Isn't there a rev limiter on those engines ? :lol::lol::lol:



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 Posted: Sun Jun 17th, 2012 09:49 am
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MaxSouthOz
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Thanks, Peter.

I think I had her red lining.  :mutley



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