N P woodchip car

N P woodchip car

Postby TiTan downunder » Sat Nov 14, 2015 7:53 am

My next project is an Northern Pacific 60' woodchip car from a 2 part article in the May & June 1977 Model Railroader. This is based on the first series of these cars # 119500 - 119699 Built by Thrall in 1966. These were end dumpers with a door on one end only.

After a couple of stuff ups - didn't look at the plans carefully enough when downsizing the measurements from O scale to TT, I finally have the scratchbuilt master finished. A rubber mould has been done and so far I have 3 good body castings. Now I have to do a load for the car and get the decals & brass etching details organised. As these cars were only built in 1966 they all passed ASAIK into BN so I'll probably do one set in NP and another in BN if I can find enough photos of the BN cars.

Model railroader.JPG


NP woodchip.JPG
2 x woodchip cars & S.Fe hopper for comparison


woodchip mould.JPG
the " little " rubber mould I use to create these beasties


I REALLY need to get a couple of my GP38/2's finished to have something to drag these around with.

( AND I even managed to find the new topic button :oops: )

Ian
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Re: N P woodchip car

Postby Bernd » Sat Nov 14, 2015 10:08 am

I got to see this car in person. Harold Russell was a member to the Rochester Model Railroad club (was the Kodak city club back then). Harold is still kicking and still working in O scale.

What casting method are you using? Smooth-On? Something else? Inquiring minds.

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Re: N P woodchip car

Postby Tom Dempsey » Sat Nov 14, 2015 2:34 pm

The cars continued to roll through Spokane in the original NP paint throughout the entire BN era and well into the BNSF era. Apparently wood chip service is not particularly hard on car finishes. I'm really interested in these cars, please PM me.
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Re: N P woodchip car

Postby TiTan downunder » Sat Nov 14, 2015 5:57 pm

< What casting method are you using? Smooth-On? Something else? Inquiring minds >

We don't get Smooth-on, etc in Australia. I can get some RTV's from Micro-Mark but, shipping is exorbitant costs. I use Dow Corning 3481 RTV when I can get it, as it is far more flexible RTV and has a better mould life. There are other substitutes available but the results aren't as good. This mould is done in the substitute RTV just to prove the car would work as a one piece body.

My next step is to make a casting master and then use that to make 2 or 3 moulds in the 3481 to get some cars cast before the summer weather hits. The urethane I use has a pot life of 15 minutes, giving me enough time to vacuum properly and reduce air bubble to a minimum. Trade off is that is that it's not much use over 28 deg centigrade as it goes off to quick. For every 1 degree over 25C it's pot life shortens by 2 minutes. De-mould time is 24 hours.

3 - vacuum.JPG


4 - cast bench.JPG
the casting / curing bench


Part of my very crowded train room

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Re: N P woodchip car

Postby CaTTwoman281 » Sat Nov 14, 2015 6:33 pm

ASAIK?
Real Women Not Only Drive Diesel Trucks, They Drive Diesel Tractors!
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Re: N P woodchip car

Postby Bernd » Sat Nov 14, 2015 9:05 pm

Thanks Ian. Very interesting.

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Re: N P woodchip car

Postby TiTan downunder » Sun Nov 15, 2015 1:28 am

ASIAK? as far as I know

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Re: N P woodchip car

Postby Taxari » Fri May 25, 2018 3:52 pm

My first one, with a little bit brass:
20171203_141428.jpg
20171203_160924.jpg
20171211_133549.jpg
20171211_133603.jpg
Last edited by Taxari on Fri May 25, 2018 3:54 pm, edited 1 time in total.
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Re: N P woodchip car

Postby Taxari » Fri May 25, 2018 3:54 pm

20171211_133642.jpg
20171211_133656.jpg
20180525_213007.jpg

My congratulation, a simple but really good made car kit. Thanks a lot
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Re: N P woodchip car

Postby AstroGoat760 » Sat May 26, 2018 12:56 am

Oooh, that is pretty!
Course Set, Speed - Maximum Warp, PUNCH IT!
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