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MATCHING M/W PRACTICE TO REQUIRED USE OF TRACK--PART III--RAIL

R E Ahlf

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Abstract

The 100-ton car has changed the criterion for rail renewal from ordinary wear to contact stress failure. Without work-hardening of the heads which took place when a high proportion of small cars were passing over newly laid rail, contact stresses are now a major problem limiting rail life. Changes in rail head design can reduce these stresses. Rail renewal should be based on ultrasonic tests, supplemented by physical inspection. Recommendations on jointed rail, continuous welded rail and relay conclude this installment.

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What this paper is about

The 100-ton car has changed the criterion for rail renewal from ordinary wear to contact stress failure. Without work-hardening of the heads which took place when a high proportion of small cars were passing over newly laid rail, contact stresses are now a major problem limiting rail life. Changes in rail head design can reduce these stresses. Rail renewal should be based on ultrasonic tests, supplemented by physical inspection. Recommendations on jointed rail, continuous welded rail and relay conclude this installment.

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Available abstract

The 100-ton car has changed the criterion for rail renewal from ordinary wear to contact stress failure. Without work-hardening of the heads which took place when a high proportion of small cars were passing over newly laid rail, contact stresses are now a major problem limiting rail life. Changes in rail head design can reduce these stresses. Rail renewal should be based on ultrasonic tests, supplemented by physical inspection. Recommendations on jointed rail, continuous welded rail and relay conclude this installment.

Key concepts: Engineering, Track (disk drive), Limiting, Welding, Rail traffic, Structural engineering, Relay, Hardening (computing)

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