Railway Inspection & Maintenance
Railroad Switch and Crossing Inspection: Critical UT Defects
Switch and crossing inspection under 49 CFR 213.235 is monthly, on foot. Which UT defects matter, why manganese frogs resist UT, and what 213.113 requires.
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Relay Rail Inspection: UT Testing Before Rail Reuse
Relay rail inspection under 49 CFR 213.237: plug rail must be tested and stay under 30 MGT since its last test. UT, classification and records explained.
Insulated Rail Joint Inspection: How UT Detects Hidden Failures
Insulated rail joint inspection under 49 CFR 236.59 and 213.121: bonded vs non-bonded joints, end post and track circuit failures, and where UT falls short.
Rail Inspection After Derailment: FRA Requirements & UT
Rail inspection after derailment: what 49 CFR 213, 225 and NTSB rules require, what 213.237 doesn't, and a worked UT scope with a reopening timeline.
Rail Grinding and Its Effect on Ultrasonic Inspection
Rail grinding removes about 0.006–0.008 in. per pass. How it changes UT coupling, clears shelling that masks defects, and fits 49 CFR 213.237 test intervals.
Rail Joint Inspection: How UT Detects Joint Bar Cracks
Rail joint inspection under 49 CFR 213.121 and 213.119: why rail flaw UT misses joint bar cracks, how joint-bar UT finds them, and CWR joint intervals.
Sun Kink Railroad: Causes of Track Buckling & Prevention
A sun kink is a heat buckle in continuous welded rail. See the thermal force math, 49 CFR 213.119 CWR plan rules, slow orders and where NDT fits in.
Slow Order Railroad: What Happens When a Rail Defect Is Found
Slow order railroad rules under 49 CFR 213.113: verify within 4 hours, apply remedial actions A to I at 10, 30 or 50 mph, and a worked timeline to rail change.
Gauge Face Wear Rail: Measurement, Limits & FRA Criteria
FRA Part 213 sets no gauge face wear limit. See the 213.53 gage limits by class, where rail wear limits come from, how to measure wear and why it affects UT.
Sperry Rail Car: How Ultrasonic Rail Testing Started in the USA
The Sperry rail car began induction rail testing in 1928. Ultrasonics followed from 1949, and FRA has required internal rail testing since 1971. Dated timeline.