July/August 2024 - 47

Percentage with Squeal LT 8
Percentage with Squeal LT 9
Figure 4. High-frequency noise events (by train population) immediately
after FM implementation (left) and after applicator optimization (right).
Graphic: ATS Consulting
maintenance checklist, the agency was able to keep the FM
application system in a state of good repair.
For inventory management, the agency kept spare parts
and consumables in stock with automatic inventory control
and re-order triggers. Friction management was also later
included in their vehicle procurement specifications, a much
less costly prospect than having to retrofit vehicles after delivery,
Mitchell noted.
This friction management/asset management plan has
proven to be very effective for the agency. The flange wear
rates after implementation fell to 0.002 mm per 1,000 km
(~7 hundred-thousandths of an inch per ~621 mi) - a figure
well below the predicted 0.01 to 0.02 mm per 1,000 km wear
rate that is typically forecast for wheels with this friction
management setup.
Another case study looked at the efforts of a transit agency
in the eastern U.S. to use onboard solid-stick friction management
to reduce derailment potential after experiencing
10 wheel/rail-related derailments during a two-year period.
The agency equipped 33 percent of each vehicle's wheels with
solid-stick flange lubrication units. Like in the previous case
study, the agency inspected and filled the applicators as part
of its regular preventive car maintenance cycle and kept spare
parts and consumables in inventory.
As part of the friction management plan, the agency modeled
the predicted effect of flange lubrication on derailment
potential. The agency models indicated that flange lubrication
would increase the lateral-over-vertical load required to
initiate a derailment by 74 percent - an improvement that
would effectively put all its potential wheel/rail interactions
below the derailment threshold, according to Mitchell. The
modeling also predicted an average flange wear reduction of
40 percent to 70 percent.
Since implementing the friction management program
in 2017, the agency has not had any derailments and flange
wear has been reduced. Figure 6 shows wheel replacements
Figure 6. Wheel replacements prior to (red) and after
(blue) wheel flange friction management implementation.
Graphic: 2018 APTA Rail Conference Proceedings
due to wear in the year prior to flange
lubrication implementation (in red) and
the year after implementation (in blue)
- an 80 percent reduction.
JULY/AUGUST 2024 | MassTransitmag.com 47
Figure 5. Examples of misaligned on-board flange
lubrication.
Graphic: L.B. Foster
Wheel replacements

http://www.MassTransitmag.com

July/August 2024

Table of Contents for the Digital Edition of July/August 2024

Editor’s Notebook
People & Places
Grade-Crossing Safety
Best & Brightest
Friction Management
Products
Best Practices
July/August 2024 - 1
July/August 2024 - 2
July/August 2024 - 3
July/August 2024 - 4
July/August 2024 - Editor’s Notebook
July/August 2024 - People & Places
July/August 2024 - 7
July/August 2024 - 8
July/August 2024 - 9
July/August 2024 - Grade-Crossing Safety
July/August 2024 - 11
July/August 2024 - 12
July/August 2024 - 13
July/August 2024 - Best & Brightest
July/August 2024 - 15
July/August 2024 - 16
July/August 2024 - 17
July/August 2024 - 18
July/August 2024 - 19
July/August 2024 - 20
July/August 2024 - 21
July/August 2024 - 22
July/August 2024 - 23
July/August 2024 - 24
July/August 2024 - 25
July/August 2024 - 26
July/August 2024 - 27
July/August 2024 - 28
July/August 2024 - 29
July/August 2024 - 30
July/August 2024 - 31
July/August 2024 - 32
July/August 2024 - 33
July/August 2024 - 34
July/August 2024 - 35
July/August 2024 - 36
July/August 2024 - 37
July/August 2024 - 38
July/August 2024 - 39
July/August 2024 - 40
July/August 2024 - 41
July/August 2024 - 42
July/August 2024 - 43
July/August 2024 - Friction Management
July/August 2024 - 45
July/August 2024 - 46
July/August 2024 - 47
July/August 2024 - 48
July/August 2024 - Products
July/August 2024 - Best Practices
July/August 2024 - 51
July/August 2024 - 52
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