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Model Railroading > Friction bearing trucksDate: 09/27/01 07:12 Friction bearing trucks Author: bobcochran When did the railroads have to comply with replacing friction bearing trucks with roller bearing trucks and when were they first introduced? I know they are still used on MOW equipment and non interchange equipment. The roof walk post got me curious.
Thanks, Bob C. Date: 09/27/01 07:56 RE: Friction bearing trucks Author: DRLOCO well, I've got a Penn Central timetable from 1968 that says nothing about restrictions, but then I have a Conrail timetable from the mid 80's that does. I'd guess sometime in the 70's but I'm afraid I'm not much more help than that~~DRLOCO
Date: 09/27/01 09:17 RE: Friction bearing trucks Author: rustedflange Friction bearing-equipped cars were finally outlawed from interchange in 1995.
I don't know of any widespread mandate that said all cars had to have roller bearings; it seems to me, roller bearings were the preferred truck anyway (ease of maintenance) so use was pretty common after they were introduced, and some roads changed out their cars quicker than others. Date: 09/27/01 14:22 RE: Friction bearing trucks Author: bobcochran Thanks DRLOCO & rustedflange
Date: 09/28/01 04:37 RE: Friction bearing trucks Author: pjb The Wheeling and Lake Erie had timken bearings trucks on hoppers ante the Great War(1913). The Southern Pacific had thielsen arch bars with roller bearing journals in 1918. So it was a long time between appearance and universal use on North American railroads.
Date: 09/28/01 06:12 RE: Friction bearing trucks Author: rogerhensley From the Central Indiana Division Rusty Spike
Vol 31 # 3 Quote Friction Bearings Banned Q) When were friction bearing (solid journal) trucks banned from interchange service? A) Friction bearing trucks were banned from interchange service on 1/1/91 for cars carrying hazardous materials. All other non-hazardous carrying cars equipped with friction bearings were banned from interchange on 1/1/94. Cars with converted friction to roller bearing side-frames were banned from interchange on 1/1/95. There were some instances of exemptions granted for shippers in "hardship circumstances" who could not comply with these dates. So, some cars did linger a little longer in interchange after the actual deadline dates. Q) I understand the logic behind eliminating solid journal (friction) bearings from interchange service, but what was the reason for outlawing trucks with conversion roller bearings? A) Hot bearing detectors couldn't "see" them when they overheated. Basic information for this article was supplied courtesy of Ed Kaminski, ACF Industries End Quote Roger Roger Hensley - rhensley@localnet.com == http://madisonrails.railfan.net/ == == Railroads of Madison County (Indiana) == Date: 09/14/18 17:45 Re: Friction bearing trucks Author: jpp452 There is no such thing as a "friction bearing." This was a derogatory term invented by the Timken roller bearing advertising department. It was not accepted by the Master Car Builders, nor its successors. The correct term is "plain" or "solid" bearing. Check the definitions section of your Car Cyclopedia. You won't find "friction bearing" there.
Railfans, including modern-era rail journalists who should know better (i.e. Kalmbach Publishing), picked up on the Timken derogatory term, thereby infecting the railfan community. Timken did a lot of advertising in Trains Magazine in the 1940s and 1950s, so perhaps that publication's adoption of the term is understandable as a means of pleasing an advertiser. The purpose of bearings is to eliminate friction. At speed, there is very little difference in rolling friction between plain and roller bearings. Roller bearings' advantage is at starting and very low speed, where their advantage is substantial. Date: 09/14/18 20:27 Re: Friction bearing trucks Author: sixaxlecentury Its even somewhat rare seeing plain bearing cars even for MOW use at this point.
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