N P woodchip car

TiTan downunder
Posts: 345
Joined: Tue Jun 22, 2010 11:14 pm
Location: NSW Australia

N P woodchip car

Post by TiTan downunder »

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
2 x woodchip cars & S.Fe hopper for comparison
2 x woodchip cars & S.Fe hopper for comparison
the " little " rubber mould I use to create these beasties
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

Tom Dempsey
Posts: 259
Joined: Sat Nov 20, 2010 8:08 pm

Re: N P woodchip car

Post by Tom Dempsey »

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.

TiTan downunder
Posts: 345
Joined: Tue Jun 22, 2010 11:14 pm
Location: NSW Australia

Re: N P woodchip car

Post by TiTan downunder »

< 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
the casting / curing bench
the casting / curing bench
Part of my very crowded train room

Ian

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CaTTwoman281
Posts: 532
Joined: Wed Jan 06, 2010 1:12 am
Location: Bemidji, MN, USA
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Re: N P woodchip car

Post by CaTTwoman281 »

ASAIK?
TT Scale... In my case, it is a family affair...

TiTan downunder
Posts: 345
Joined: Tue Jun 22, 2010 11:14 pm
Location: NSW Australia

Re: N P woodchip car

Post by TiTan downunder »

ASIAK? as far as I know

Ian

Taxari
Posts: 168
Joined: Mon May 17, 2010 5:03 am
Location: Halle (Saale), Germany

Re: N P woodchip car

Post by Taxari »

My first one, with a little bit brass:
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Last edited by Taxari on Fri May 25, 2018 3:54 pm, edited 1 time in total.

Taxari
Posts: 168
Joined: Mon May 17, 2010 5:03 am
Location: Halle (Saale), Germany

Re: N P woodchip car

Post by Taxari »

20171211_133642.jpg
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20180525_213007.jpg
My congratulation, a simple but really good made car kit. Thanks a lot

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AstroGoat760
Posts: 4101
Joined: Fri Jul 24, 2009 8:07 pm
Location: Bemidji, Minnesota, USA

Re: N P woodchip car

Post by AstroGoat760 »

Oooh, that is pretty!
Life is short, play with TT Scale Trains!

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Arseny
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Joined: Fri Jul 03, 2009 4:42 am
Location: Saint-Petersburg, Russia

Re: N P woodchip car

Post by Arseny »

Great work!

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MacG
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Joined: Mon Aug 15, 2011 1:19 pm
Location: Dresden, Germany

Re: N P woodchip car

Post by MacG »

Great model Ian! Clean work Taxari! I will order some kits.
Lok-n-Roll.de - we send worldwide :wink:

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