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SUMMARY:Bogie Damage: Train or Track? - Dr Stuart Grassie\, Railmeasuremen
 t Ltd
DTSTART:20230428T150000Z
DTEND:20230428T160000Z
UID:TALK199612@talks.cam.ac.uk
CONTACT:46601
DESCRIPTION:A railway system received a new fleet of trains from a major a
 nd highly respected supplier.  The trains were delivered in three tranches
 \, the first of which was introduced about a decade before the third and l
 ast.  A section of track between major cities was also rebuilt.   \n\nWith
 in two years of the third tranche of trains entering service\, and within 
 months of the new line opening\, cracks were observed in the bogies of all
  three sets of trains. No cracks had been observed in the previous decade 
 in any of the bogies of the first two tranches of trains\, nor indeed had 
 this problem been experienced on other fleets of the same type of vehicle 
 that operated elsewhere.   \n\nAn emergency programme of inspection and we
 ld-repair was started to ensure that the trains could continue to operate 
 safely.  The supplier instrumented bogies to measure accelerations\, strai
 ns and track geometry\, and undertook modelling of the vehicles with the m
 easured inputs.  This work was completed within 6 months of the rebuilt li
 ne opening to traffic and only 4 months after cracks were first observed. 
  It quickly identified that track conditions were more severe than those f
 or which the bogies were designed.  \nNevertheless\, the fatigue life calc
 ulated using measured inputs was an order of magnitude greater than had be
 en experienced in service. \n\nThe root cause of the problem was revealed 
 during a field visit that took place after the measurements and modelling.
   During this visit\, measurements were made using simple equipment that w
 as purchased in a local hardware shop. \n
LOCATION:JDB Seminar Room\, CUED
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