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EFFECT OF HIGHER AXLE LOADS

EFFECT OF HIGHER AXLE LOADS. A STUDY ON ALLAHABAD DIVISION OF NCR BY A. B. KHARE DY CE TP NCR SUMEET SINGHAL SR DEN III/ALD. NCR’s SCENERIO. AXLE LOAD WAS PERMITTED ON NCR IN APR 2005 MAINTENANCE EFFORT- DIFFICULT TO QUANTIFY GENERAL FEAR OF INCREASING RF/WF

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EFFECT OF HIGHER AXLE LOADS

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  1. EFFECT OF HIGHER AXLE LOADS A STUDY ON ALLAHABAD DIVISION OF NCR BY A. B. KHARE DY CE TP NCR SUMEET SINGHAL SR DEN III/ALD

  2. NCR’s SCENERIO • AXLE LOAD WAS PERMITTED ON NCR IN APR 2005 • MAINTENANCE EFFORT- DIFFICULT TO QUANTIFY • GENERAL FEAR OF INCREASING RF/WF • RF/WF DATA OF ALLAHABAD DIVISION ANALYSED

  3. EFFECT ON RF/WFs • RAIL REPLACEMENTS • GMT CARRIED BY RAILS • FATIGUE IN RAILS • EFFECT OF BALLAST CUSHION/DS • TEMPERATURE VARIATIONS IN THE YEAR • DE-STRESSING TEMPERATURE • AGE OF DE-STRESSING

  4. RAIL LENGTH IN TRACK KM.

  5. NO. OF RAIL FRACTURES

  6. SALIENT FEATURES (MGS-ALD) • 60 KG RAILS- 66% 52 KG RAILS- 34% • 80% OF THESE COMPLETED MORE THAN HALF OF LIFE • IN 60 KG • FR/KM INCREASED FOR 500, 600 & 700 GMT BANDS • NO DEFINITE TREND FOR < 500 GMT • IN 52 KG • FR/KM INCREASED FOR 700 GMT • DECREASED TREND FOR 300-500 GMT

  7. SALIENT FEATURES (ALD-CNB) • 60 KG RAILS- 64% 52 KG RAILS- 36% • 65% OF 60 KG RAILS & 35 % OF 52 KG RAILS HAVE COMPLETED MORE THAN HALF STIPULATED LIFE • IN 60 KG • NO DEFINITE TREND EXCEPT FOR 800 GMT • IN 52 KG • NO INCREASED TREND FOR 500-800 GMT EXCEPT FOR 800 GMT

  8. SALIENT FEATURES (CNB-TDL) • 60 KG RAILS- 54% 52 KG RAILS- 46% • 67% OF 60 KG & 75% OF 52 KG RAILS HAVE COMPLETED MORE THAN HALF STIPULATED LIFE • IN 60 KG • INCREASING TREND FOR >600 GMT • NO DEFINITE TREND FOR < 600 GMT • IN 52 KG • FR/KM INCREASED FOR 600 GMT • DECREASED TREND FOR 300-500 GMT

  9. SALIENT FEATURES (TDL-GZB) • 60 KG RAILS- 78% 52 KG RAILS- 22% • NEWER RAILS –ONLY 20% HAVE COMPLETED MORE THAN HALF OF LIFE • IN 60 KG • NO DATA FOR 400 GMT & ABOVE BANDS • NO DEFINITE TREND • IN 52 KG • NO DATA FOR 600 GMT & ABOVE BANDS • INCREASED TREND FOR 400-500 GMT BANDS

  10. EFFECT OF DEEP SCREENING(ALD-CNB SECTION) • FRESHLY SCREENED TRACK • NO DECREASE • DUE TO INITIAL CONSOLIDATIONS • CREATION OF SECONDARY VOIDS • RESILIENT TRACK • NO INCREASE IN FR/KM • NON RESILIENT TRACK • INCREASED FR/KM

  11. CONCLUSION • GENERAL FEELING OF INCREASE IN RF/WF • INCREASE IN ABSOLUTE NOs • NO INCREASE DUE TO AXLE LOADS • BUT DUE TO • GMT CARRIED • AGE OF RAIL • NON-RESILIENCY IN TRACK

  12. LIMITATIONS • DATA OF VERY SHORT PERIOD • EACH FACTOR ANALYSED SEPARATELY • COMBINED EFFECT COULD BE DIFFERENT • DIFFICULT TO RELATE RF/WFs WITH OTHER MAINTENANCE FACTORS • NEEDS TESTING WITH LONGER TIME SPAN

  13. THANKS

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