Safety Alert: Steerable Bogies Degraded Steering and Derailment Risk
Summary
ONRSR issued Safety Alert RSA-2026-001 warning Rolling Stock Operators about degraded steering components on steerable bogies causing elevated wheelset dynamics and loss of braking effort. The alert requires operators to inspect for wear on adapter rubber pads and cross-anchor bushes, verify steering mechanisms control wheelset movement correctly, and confirm bogie-mounted brakes function in worst allowable condition. Operators procuring steerable bogies must ensure components meet required standards and account for associated maintenance requirements.
Rolling Stock Operators with steerable bogie-equipped vehicles should audit their maintenance inspection protocols specifically for adapter rubber pads and cross-anchor bushes—the two components identified as critical failure points. Operators who have not previously tracked these components separately from general bogie maintenance should establish a baseline inspection and degradation monitoring schedule, particularly for vehicles operating on lower-quality track where elevated wheel-rail forces pose greatest derailment risk.
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What changed
ONRSR issued Safety Alert RSA-2026-001 addressing a potential safety issue with steerable bogies on rail vehicles. The alert identifies that degraded steering components—including adapter rubber pads and cross-anchor bushes—can cause elevated wheelset dynamics and excessive piston travel on bogie-mounted brakes, resulting in loss of braking effort and increased derailment risk on poor track.
Affected Rolling Stock Operators must conduct inspections to identify wear and degradation, verify steering mechanisms maintain correct wheelbase, and confirm brakes function in worst allowable conditions. Operators procuring steerable bogies should ensure components meet required standards and understand associated maintenance needs. The alert is effective immediately.
What to do next
- Inspect rolling stock for signs of wear, degradation and ineffective function of steerable bogie components such as adapter rubber pads and cross-anchor bushes
- Verify steering mechanisms on steerable bogies are functioning correctly to control wheelset dynamic movement and maintain wheelbase
- Confirm bogie-mounted brakes function correctly when bogies and/or brake rigging are in the worst allowable condition
Archived snapshot
Apr 25, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
Wednesday, February 11, 2026
Safety Alert RSA-2026-001: Steerable bogies
Risk of elevated wheelset dynamics and poor performing bogie-mounted brakes due to degraded steering components on steerable bogies.
ONRSR has identified a potential issue with steerable bogies, whereby the steering mechanism on the bogie degrades and causes elevated wheelset dynamics and excessive piston travel on bogie-mounted brakes, resulting in loss of braking effort.
The steering mechanism on steerable bogies is designed to control wheelset dynamics and maintain bogie wheelbase while allowing the wheelsets to orient radially in curves. Typical steering mechanism components are shown schematically below and include:
a) Two sub-frame adapters connected to bogie side frames (not shown) by adapter rubber pads, and
b) Two cross anchors connected to the sub-frame adapters by pins and bushes.
If the steering components on steerable bogies are not designed and maintained to required standards, and become degraded:
a) Wheelsets can undergo elevated dynamic movements causing increased wheel-rail forces and derailment risk on poor track; and
b) Bogie wheelbase can vary dynamically, which can negatively affect bogie-mounted brake performance.
Rolling Stock Operators (RSOs) must ensure:
a) Rolling stock inspections identify signs of wear, degradation and ineffective function of steerable bogie components such as adapter rubber pads and cross-anchor bushes.
b) Steering mechanisms on steerable bogies are functioning correctly to control wheelset dynamic movement and maintain wheelbase.
c) Bogie-mounted brakes function correctly when bogies and/or brake rigging are in the worst allowable condition.
RSOs should examine all risks associated with wheelset dynamics and braking performance on their rolling stock, including in minimum maintainable condition.
RSOs procuring, or considering procuring, steerable bogies with components such as adaptor rubber pads and cross anchor bushes should ensure these components meet required standards and should be aware of the extra maintenance associated with steering mechanisms.
This advice is effective immediately.
Last updated: Feb 12, 2026, 8:48:08 AM
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