What is the TGSD Calculator?

This post follows up from the Faith of TGSD Calculator. Before my four year too late discussion with David Marriott I wrongly believed that the TGSD Calculator computes a special kind of uncompensated accelerations that appear only at the points where any design element changes to another and turns those into a wave-like shape that…

The Faith of TGSD Calculator

Motto: “I am not the Messiah!”,  Brian For quite some time I wanted to write a post about two articles published in the Permanent Way Institution Journal, co-authored by David Marriott and me, articles referring to the “inherent standard deviations”. I’ll try to do that but first I will need to tell you, dear reader,…

Evaluation of the track quality

Track measurement The importance  of  knowing  the  track  geometric  quality  arose  in  the  middle  of  20th  century,  when  European infrastructure managers developed their own track recording vehicles allowing a continuous measurement of track geometry and based on this, their own track geometry quality evaluation standards (EN 13848-6). Periodic track measurement is required to evaluate the…