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I have attached my only shot of one of the 36 foot GS gondolas which
lasted in service until 1959,
if not later! (Just over 100 were still in service in 1955, a
decline from the almost 700 cars in 1950.)
The photo is from Barstow, in the 1940's.
On 2/10/2019 11:48 AM, Corey Bonsall
Maybe it's time I step out of the shadows to explain some of what
I've been doing with these 3D printed cars...
Let's start with some history, most of which I have gleaned from
Jim Eager's article in the second quarter 2002 issue of The
Prospector (Rio Grande Modeling & Historical Society, Volume
1, Number 2):
Overall, ten series of steel GS gondolas, built between 1908 and
1954, totaling 8,251 cars.
(All lengths are interior)
They started with 2501 of the 36 ft cars (40000-42500) in 1908-09,
followed by 350 of the 40 ft cars (43000-43349) in 1912-13. The
big "offset" cars of 46 ft length (700 total in the 70000-70699
series) showed up in 1922, with 500 of the shorter offset 42 ft
(45000-45499) cousins in 1926.
I think Mark Hemphill (Thanks, Mark!) has me beat on the details
of the rest of the fleet already in another thread that just
showed up in my email...
Those are the cars I have designed and printed to this point,
since I really wanted a fleet of D&RGW GS gondolas, but other
than the brass W&R cars, and the somewhat close Red Caboose
class of 42ft 46k series cars, there wasn't anything close. As
the time spent drafting up the cars is one of the larger
investments I have, I started with what I wanted (cast grabs, for
durability, and for large fleet expediency), and am working
through adding a "blank" option for all of the cars for those who
want the option to drill and form their own grab irons, and spend
more time on the brakes.
The cars are all printed on a Form 2 printer, using their standard
black resin (methyl-acrylic-something-something), but in response
to Bill's question, it
does NOT carve like styrene. It can be
sanded, or filed, but using a knife-edge makes it crack. Some of
the dimensions I have to compromise, due to the limitations of the
printer, but I think the overall result has easily passed my
normal "Two Foot Rule" I use in my modeling.
Some of my finished cars should be visible in the album links
I have not attempted resin casting, as there are a lot of
overhanging details that I felt would not release from the molds,
and I wasn't quite ready to jump into a second new avenue for
myself. I am doing this as a side hobby from my normal day job,
so the progress can seem eternally slow.
I am grateful for the support I've received on this endeavor, and
I hope to continue working through the many related possibilities
in under-represented models as time allows.
Bonsall Scale Carshops