Re: Gilbert-Nelson


Bill Daniels <billinsf@...>
 

Thanks, Tim and Dave. 


On Jun 21, 2017, at 6:57 PM, devans1@... [STMFC] <STMFC@...> wrote:

 

Beyond the timeframe of this list, but to address one of the statements:

A 1979 book by ASME's Rail Transportation Division includes a figure from an AAR "Quarterly Overheated Journal Report" from 1978 that plots bearing types, and overheated journals for 1972-1978. It reports the 50-50 crossover from "plain journal cars" to "roller bearing cars" occurred in about July 1972. By the summer of 1978, the ratio was still only around 33-67 (2/3rds roller bearing equipped.) By 1978, even though only 1/3 of the fleet, plain bearing cars accounted for 89% of bearing overheats. Failure rates per car mile are not provided.

The book states:

- Roller bearings were made standard by AAR for new cars of 100 tons or more capacity in 1966

- Roller bearings were made standard by AAR for all new cars in 1968

- Roller bearings were made standard by AAR for all rebuilt cars in 1970

"No field lubrication" roller bearings were made standard in 1976

Dave Evans

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