Scratchbuilt SP A 50-17 Auto Box

Scratchbuilt SP A 50-17 Auto Box

Postby Shipsure » Mon May 12, 2014 4:39 pm

Now that I have the Bulkhead behind me, and I am noodling around the best way to attack a caboose, I started work on a Classic SP car, the offset double door, 50' boxcar. Generally SP had center doors on the Double Door cars, but for the auto trade the offset them. The advantage here is that the offset is more like a general PS1 than a RR specific car.

For this project I used the laser to mill the detail into a sheet of Plexiglas in different layers to get the detail I wanted. The thought of putting down 5,000 oversized rivets was a non starter. This way, in a matter of a half hour, I had the first casting ready to proof. I'll outline the process more later on, but here are some initial shots. The first is a wood proof so you can see how the detail was applied. The other two are shots of the surface cast of the plexi framed with an outline of the car it'self. I'll be able to use the same process for the doors, ends and roof, as well as the underframe. Wall thickness will be in the .040 range on the final castings and the doors will be separate to be positioned. I will also be able to laser etch the detail on the resin parts for the interior showing the plywood sections and the lash down points. This process may even work to create side frames for trucks. I'll be going back and working on the settings to make the rivets a bit less obvious, add ladders and grab irons for the next round.

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Re: Scratchbuilt SP B50-17 Auto Box

Postby Marquette » Mon May 12, 2014 4:47 pm

That's looking great!

Can you give a bit more info on these cars, please? My copy of Tony Thompson's SP boxcar book is currently out on loan to a friend so I can't check... what was the number series, and what year did these cars enter service?
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Re: Scratchbuilt SP B50-17 Auto Box

Postby Shipsure » Mon May 12, 2014 4:57 pm

Sure, they were build by the SP shops starting in 1950 and started with series 190000. Looks like 1500 were built between the 17/18 styles. I will do both sides, and roofs with and without roofwalks and short ladders. Most of the rivet side cars fell out of service in the early 2000's but you still see them around remarked.
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Re: Scratchbuilt SP B50-17 Auto Box

Postby Shipsure » Mon May 12, 2014 5:04 pm

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Re: Scratchbuilt SP B50-17 Auto Box

Postby Marquette » Mon May 12, 2014 5:05 pm

1950? Excellent! Are you planning on making this available as a kit? I'd definitely be interested in one of whichever type was earlier, it'd still be pretty clean-looking in my 1952 setting!

Did a quick look in my 1/53 ORER, I see the 190000-190499 series but I don't see anything with dimensions at all similar in the T&NO listings. Did they get any of them eventually or were these just a SP Lines West thing? Not that I can build one like that since there weren't any such in 1952, but am just generally curious.
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Re: Scratchbuilt SP B50-17 Auto Box

Postby Shipsure » Mon May 12, 2014 5:23 pm

I would suspect some of the SP shop built cars were loaned or used in T&NO service. I even heard about some of these going to Rock Island, but I haven't seen any photos to confirm. I chose this car because it's closest to the standard PS1 which TNO had... I am also planning on releasing this as a kit. It may be flat cast depending on the detail...but being a lazy builder, will probably end up doing a hollow one piece cast with a separate underframe. I will cast those in tooling epoxy with metal powder added to get the weight up without having to put weights inside the car.

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Re: Scratchbuilt SP B50-17 Auto Box

Postby areibel » Mon May 12, 2014 5:42 pm

Oh man, I've wanted a TT scale PS-1 for a long time! This is definite train porn!
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Re: Scratchbuilt SP B50-17 Auto Box

Postby Marquette » Mon May 12, 2014 5:45 pm

Well, definitely looking forward to this one. Have I said that yet? :D
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Re: Scratchbuilt SP B50-17 Auto Box

Postby Shipsure » Mon May 12, 2014 8:35 pm

Image

Here's another pass with additional details. I need to do some slight clean up and next pass will be a keeper.

First round on the roof. Once this is dialed in then I will Vacuum-form .005 styrene over the pattern to get the correct inside radius in the landings.

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Re: Scratchbuilt SP B50-17 Auto Box

Postby Marquette » Mon May 12, 2014 9:00 pm

Question - from the drawing it appears that the roof is peaked, but yours there looks flat... or am I seeing the drawing wrong?
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