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| Listings of minimum radius/curvature for various rail cars? https://www.rypn.org/forums/viewtopic.php?f=1&t=33674 |
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| Author: | atsfm177 [ Tue Jul 31, 2012 1:46 pm ] |
| Post subject: | Listings of minimum radius/curvature for various rail cars? |
I'm looking for a publication that lists the minimum radius curve various railcars can negotiate safely. I've looked at some online sample pages of The Official Railway Equipment Register, and while it seems to have all the dimensions you would want, it doesn't list the curving ability, not at least on the pages I saw. I've gone through my Car and Locomotive Cyclopedia and while I do see curvature data on a few cars, it isn't all inclusive and certainly doesn't include all the older cars still out there. Is there another publication out there? Greg |
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| Author: | atsfm177 [ Tue Jul 31, 2012 6:18 pm ] |
| Post subject: | Re: Listings of minimum radius/curvature for various rail ca |
Answering my own question always seems a bit strange, but I got the following answer from one of my POCs in another of the services. =============================== A. From the Association of American Railroads' Manual of Standards and Recommended Practices, Section C, Part II, Volume 1: 2.1.4.2 Horizontal Curve and Tangent: "Cars shall be design to operate over the respective horizontal curves without interference between trucks, car body, and brake rigging. In addition, cars shall be designed to negotiate a No. 7 crossover having 13-ft track centers when coupled to a like car or AAR base car. . . " 2.1.4.2.1 Minimum Curve Coupled to Base Car and Like Car: Length over pulling faces of couplers over 75 ft Minimum radius base and like car 350 ft 2.1.4.2.2 Minimum Curve for Cars Uncoupled: For cars having truck centers greater than 46 ft 3 in. - 180-ft radius 2.1.4.2.3 Base Car Length over pulling faces of couplers 44 ft 7 7/8 in. Radius = 5730/degrees (approximately), so 350' radius gives a curve between 16 and 17 degrees, 180' radius gives a curve slightly over 32 degrees. B. Railroad responses to question of what is their maximum track degree of curve" CSX: 10% of route miles are on lines with curves of 12 to 20 degrees. NS: 2% of all miles of curves are 12 to 20 degrees BNSF: 8 curves comprising 0.57 miles of track have radii of 13 degrees or more UP: Some main tracks have curvature up to 15 degrees KCS: A few tracks have curves up to 15 degrees ========================= Greg |
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