Across the Continent: The Union Pacific Photographs of Andrew J. Russell by Daniel Davis

2019 ◽  
Vol 54 (3) ◽  
pp. 333-335
Author(s):  
Emily J. Rau
Keyword(s):  
Union Pacific

Vibration Signatures of Temperature Trended Bearings in Field and Laboratory Testing

2009 ◽  
Author(s):  
Constantine M. Tarawneh ◽  
Javier A. Kypuros ◽  
Arturo A. Fuentes ◽  
Brent M. Wilson ◽  
Bertha A. Gonzalez ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Vibration Signal ◽  
Laboratory Research ◽  
University Of Texas ◽  
Union Pacific ◽  
Bearing Vibration ◽  
Pan American ◽  
Testing Field ◽  
The University ◽  
Vibration Signatures

Over the past two years, a series of papers have been published concerning bearing temperature trending and a mechanism to explain this troubling phenomenon. In September of 2008, a collaborative field test between The Union Pacific Railroad (UP), Amsted Rail, Rail Sciences Inc. (RSI), and The University of Texas-Pan American (UTPA) was conducted to corroborate the findings of laboratory research and testing. Field and laboratory results confirm that temperature trended bearings exhibit vibration signals that can be distinguished from healthy bearings. Distinct primary frequencies and overtones associated with the axle, cone, cage, and rollers can be readily identified within a bearing vibration signal. In a previous paper, it was demonstrated that a trended bearing exhibits vibrations of higher magnitude. However, all characteristic frequencies appear in both healthy and trended bearings, but those that dominate, i.e., have higher magnitude, are distinct for trended bearings when compared to healthy bearings. The latter can be repeatedly demonstrated in both field and laboratory experiments. Moreover, the current work identifies and distinguishes between the primary bearing frequencies and those linked to roller misalignment, which is known to increase friction and wear, and consequently raise the bearing temperature.

The Decision on the Union Pacific Merger

1913 ◽  
Vol 27 (2) ◽  
pp. 295
Author(s):  
Stuart Daggett
Keyword(s):  
Union Pacific

Union Pacific Country

1972 ◽  
Vol 3 (1) ◽  
pp. 85
Author(s):  
Gerald T. White ◽  
Robert G. Athearn
Keyword(s):  
Union Pacific ◽  
Pacific Country
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