Unsaturated Railway Track-bed Materials – Yu-Jun Cui (2016)

  • Date: 2016
  • Author: Yu-Jun Cui
  • Year: 2016

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Methods of Track Stiffness Measurements – INNOTRACK GUIDELINE – Project No. TIP5-CT-2006-031415 (2006)

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Date: 2006

Vertical track stiffness is an important parameter in railway track engineering, both from a design and maintenance point of view. This guideline presents important aspects of track stiffness as well as different measurement methods to gather stiffness information of the track.

A method called Panda, for determining local track stiffness has been used and developed. Panda is a lightweight penetrometer which determines the cone-resistance of the layers of the track substructure rapidly.

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Railroad Subgrade Support and Performance Indicators – Research Report KTC-12-02/FR136-04-6F – Michael Henry & Jerry Rose – University of Kentucky

Author: Michael Henry & Jerry Rose

Date: February 2012

The subgrade is an integral component of the track structure and its performance properties must be considered in order to effectively assess its influence on subsequent track quality. European and Asian railways are particularly advanced in implementing subgrade performance indicators into their track designs and assessments. As train speed and tonnage increase in the U.S., the evaluation and influence of subgrade performance will become even more paramount.

There are numerous means of measuring and predicting subgrade performance. Both laboratory and in-situ test methods have been used. A review of available testing methods is presented herein in the context of railroad subgrade assessment. Discussion on the applicability of each test to the American railroad industry is also included. In-situ tests likely provide the greater advantage in railway engineering because results can typically be obtained quickly, more cost effectively, and with a larger data set. Newer rail-bound, continuous testing devices, while not testing the subgrade directly, are extremely convenient and will likely become more common in the future.