Transitioning from Reactive to Proactive
Track Management on Network Rail
(continued)
While wear can keep rcf in check, achieving
a steady-state wear condition typically requires a combination
of rail grinding, which simulates natural wear and prevents cracks
from propagating, lubrication and proper alignment. Grinding
(primary) and lubrication (secondary) are most effective in controlling
rcf in steady-state curve conditions. Grinding (primary) and
alignment (secondary) provide the best defense in bi-stable conditions,
while alignment (primary) and grinding (secondary) are most effective
in convergent conditions, Sanford said.
NR has established an aggressive ultrasonic rail testing program
to find and remove defects before they generate rcf. NR has also
focused on finding discreet lateral anomalies in track geometry,
which have been shown to generate stresses in the railhead.
Rail Grinding
NR has instituted an innovative, perhaps revolutionary, approach
to rail grinding on its mainlines. By introducing its three 64-stone
production grinders into the timetable as slow-moving trains
(NR also operates two 32-stone grinders for corrugation removal
and five switch grinders), the railway is able to grind a total
of 60 to 75 miles per night. "Since they're shown on the
timetable, we know exactly where they are and when they're going
to run," Sanford said. "They don't have to duck on
and off track." This approach has increased production from
200 miles ground per year in 1999 to 3,700 miles ground per year
today.
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