The Gage Restraint Measurement System (GRMS) is an instrumented rilroad car which measures the effectiveness of the teis and fasteners in maintaining gage under load. This involves applying a gage-widening load and measuring the resultant change in gage. In some measurements on weak track a directional dependence of the GRMS loaded gage measurement has been observed. Measurements taken from a forward traveling GRMS hsowed a consistent difference from data taken from the GRMS that backs up over the same section of track.
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