United States Department of Transportation
[PDF-2.32 MB]
Details:
-
Creators:
-
Corporate Creators:
-
Subject/TRT Terms:
-
Resource Type:
-
Geographical Coverage:
-
Edition:Powerpoint
-
Corporate Publisher:
-
Abstract:This presentation deals with two separate, but related topics: Train resistance and energy consumption, and air pollutants generated by locomotives. Its discussion of train resistance focuses on measures that can be taken to reduce resistance:
• The constant term “A” reflects wheel bearing drag and wheel/rail friction. Bearing drag with a rubbing seal typically is 10 lbs. per bearing. However, removal of the seal reduces drag by 50%, and new labyrinth seals which are non-rubbing can reduce bearing drag by 30% or more. Wheel/rail friction can be reduced both by gage-face and top-of-rail lubrication. Results are presented showing the effectiveness of both lubrication approaches to reducing the rolling resistance of trains.
• The velocity term “B” reflects track bed deformation which is (nearly) zero.
• The velocity-squared term ‘C” reflects aerodynamic drag and depends on the characteristics of the train consist, including the order in which cars are placed in the train.
The train resistance section concludes with charts summarizing the fuel consumption due to each resistance factor for a typical intermodal train. The emissions section quantifies the contribution of railroad locomotives to NOx, Particulate Matter and CO2 emissions, along with mitigation strategies that railroads can use for reducing emissions. The presentation recommends more widespread adoption of Low Torque Roller Bearings, improvements in wheel and rail lubrication, and improved loading methods for intermodal trains for reducing aerodynamic drag.
-
Format:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type:
