Discussion in 'GP7' started by fredman23, Sep 28, 2013.
Two GP-7s at the High Street service track (in Oklahoma City) in the late 1970s.
The 517 is the Geep that I have my Grandpa pictured in. But in an earlier B/Y paint. This shows it in service many years after he retired. Always good to see any Frisco picture that has been in a drawer or otherwise not seen.
Thanks for posting!!
Look at those Leslies up on top of 517 and 520. Good old Frisco, they even wanted the Geeps to sound good!
They are standing tall and proud aren't they? How do we model those washtub spark arrestors?
O or S scale round DW parts I am pondering???
not sure of the details on those, but looks as if three sections of tubing placed inside each other might work?
I have no idea what in the world those are, let alone how to model them!
Are they spark arrestors? Or are they roof vents from a building behind the GP 7's?
Agree! I'm thinking they are domes on the tank/tanks behind the o/w GP7 SLSF 520, or something on the building. I've never seen anything that looks like that as a spark arrestor on top of a Frisco GP7, or any other GP. It does look like one of the little "canopy" spark deflectors they used is mounted on the rear exhaust of 520, and you can see the edge of the front one as well before it gets lost in the background noise.
check these out; they are pictures from fallen flags or picture archives on the web. These are some big square ones and big round ones different stuff here.
Maybe! But, the "things" on 520 look round to me. These in your posted pics are square - probably home made by the SLSF. The ones on 510 could be the same - they look to be rounded (?) and have the connection to the exhaust stacks like on 520. What does the group think?
Love that top-side view!
Pretty sure that I have seen the round ones on some other RR loco's.
may have been Milwaukee, Burlington, MKT, or GN.
not much help at the moment, sorry.
Found a couple that may help?
As more roads dieselized, and as the early diesels aged a bit and started throwing more sparks - the rate of line-side fires became more of a problem. I remember in the late summer in Rolla while I was at MSM, 1960, 61, etc, I recall the Frisco being accused of setting fires in the local paper. I'm sure this was occurring across the country as well. I'd bet the Frisco's first thought was to design a spark catching device for their diesel exhausts, mainly on the EMD's as this was mainly a two-cycle problem. That may be what we see on 510 & 520. The four-cycle road engines were turbocharged, which was in itself a good spark eliminator. At the same time, the market realized an opportunity, and commercially designed spark arrestor devices became available. Eventually, the Frisco settled on the familiar screen-lifting type they used on all non-turbo engines, including on some Baldwin VO's and EMD NW's & SW's. Some of the FM's had a big spark screen in them. I'm not sure if any gadgets made it on top of an Alco S-2 or S-4.
Those big square ones don't look quite as gargantuan as those round ones. They both look kinda out of place to me. But that's my opinion.
Tom, if your planning on modeling these, here are a few more pic.
Don't know if this helps the discussion or not. Sorry I couldn't get any closer.
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