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 Post subject: What is the min radius curve a 90' railroad car will handle?
PostPosted: Thu Nov 09, 2017 3:29 pm 

Joined: Sun Aug 22, 2004 10:52 pm
Posts: 311
Location: Ventura County, CA
I get asked this question from various bases from time to time, and while I can make an educated guess based on problems we've had in the past, I've not found an authoritative source I can refer people too.

I have a relatively recent Car & Locomotive Cyclopedia and while it lists lots of data for most cars out there, nowhere does it list minimum curve data.

Can anyone refer me to a better reference?

Greg

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Greg Ramsey
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 Post subject: Re: What is the min radius curve a 90' railroad car will han
PostPosted: Sat Nov 11, 2017 5:39 am 

Joined: Mon Aug 18, 2008 11:48 pm
Posts: 7
Location: Watchung, NJ
Hello Greg,

I don't know exactly what type of car you are referring to, but I will assume it might be an 89' flatcar.

The minimum curvature can vary depending on whether the car is coupled, or uncoupled as it negotiates a curve.

I've provided this link below to Greenbrier International's website. As you may be aware, they manufacture 89' flatcars.

https://www.gbrx.com/manufacturing/nort ... 9-flatcar/

According to the specifications listed on above webpage, the minimum radius curvature appears to be 350' (when coupled to either a base car, or a "like" car). The needed radius is considerably less if the car negotiates the curve "uncoupled".

Hope that answers your question.

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 Post subject: Re: What is the min radius curve a 90' railroad car will han
PostPosted: Sat Nov 11, 2017 9:15 pm 

Joined: Tue Aug 24, 2004 12:13 pm
Posts: 399
Location: Baltimore. MD
That would be about a 16 1/2 degree curve.

Steve


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 Post subject: Re: What is the min radius curve a 90' railroad car will han
PostPosted: Sun Nov 12, 2017 1:30 pm 

Joined: Sun Oct 19, 2008 12:58 pm
Posts: 1197
Location: Chicago USA
The minimum curve would vary with the distance of the truck centers from the ends, no? Does that ever vary?


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 Post subject: Re: What is the min radius curve a 90' railroad car will han
PostPosted: Sun Nov 12, 2017 3:17 pm 
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Joined: Thu Oct 08, 2015 11:54 am
Posts: 148
Location: Orrville, OH
It sure does. It depends on the type of car and the type of draft gear.

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 Post subject: Re: What is the min radius curve a 90' railroad car will han
PostPosted: Mon Nov 13, 2017 9:30 pm 

Joined: Wed Feb 02, 2011 9:40 pm
Posts: 723
Eric S Strohmeyer wrote:
Hello Greg,

I don't know exactly what type of car you are referring to, but I will assume it might be an 89' flatcar.

The minimum curvature can vary depending on whether the car is coupled, or uncoupled as it negotiates a curve.

I've provided this link below to Greenbrier International's website. As you may be aware, they manufacture 89' flatcars.

https://www.gbrx.com/manufacturing/nort ... 9-flatcar/

According to the specifications listed on above webpage, the minimum radius curvature appears to be 350' (when coupled to either a base car, or a "like" car). The needed radius is considerably less if the car negotiates the curve "uncoupled".



Which begs the question of how it gets around any curve without being coupled to something, whether a locomotive or another car. Or do you just kick it and cut it loose and ride the handbrake?


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 Post subject: Re: What is the min radius curve a 90' railroad car will han
PostPosted: Tue Nov 14, 2017 6:17 pm 

Joined: Sun Aug 22, 2004 10:52 pm
Posts: 311
Location: Ventura County, CA
[quote="Lincoln Penn

Which begs the question of how it gets around any curve without being coupled to something, whether a locomotive or another car. Or do you just kick it and cut it loose and ride the handbrake?[/quote]

In the Naval Shipyards where we have a LOT of really tight curves, we move some cars around tight curves individually with locomotives equipped with couplers that can slide laterally across the locomotive to accommodate the offset. Alternatively, you can use a rubber tired tractor equipped with a coupler.

Greg

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 Post subject: Re: What is the min radius curve a 90' railroad car will han
PostPosted: Wed Nov 15, 2017 12:43 pm 

Joined: Fri Dec 03, 2004 9:42 pm
Posts: 2435
Quote:
In the Naval Shipyards where we have a LOT of really tight curves...


Puget Sound Naval Shipyard has that problem as well. They also have what is most likely the newest 40 foot flatcar on the planet. Brand new, very heavy duty, but really short to go around the tight radius. They could possibly be 50', but they sure look like 40's!


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 Post subject: Re: What is the min radius curve a 90' railroad car will han
PostPosted: Wed Nov 15, 2017 3:32 pm 

Joined: Mon Aug 23, 2004 9:37 pm
Posts: 244
Location: Niles Canyon Railway, near Sunol, CA
Minimu radius may also be limited by the maximum truck swing (rotation) before something starts to bind.

Passenger car disk brake disks have been damaged beyond repair by chafing (chewing into is a better description) against carbody center sills on way-too-tight shipyard access track curves designed to barely accommodate 40' boxcars coupled together.

- Doug Debs


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