---
kind: "section"
citation: "49 C.F.R. § 299.411"
title: "49"
number: "299.411"
heading: "Bogies and suspension system."
url: "https://uscodex.org/cfr/49/299.411"
---

# §299.411. Bogies and suspension system.

- (a) **Wheel climb.**
  - (1) Suspension systems shall be designed to reasonably prevent wheel climb, wheel unloading, rail rollover, rail shift, and a vehicle from overturning to ensure safe, stable performance and ride quality. These requirements shall be met—
    - (i) In all operating environments, and under all track conditions and loading conditions as determined by the railroad; and
    - (ii) At all track speeds and over all track qualities consistent with the requirements in [subpart C](/cfr/49/subpartC.md) of this part, up to the maximum trainset speed and maximum cant deficiency of the equipment in accordance with [§ 299.609(g)](/cfr/49/299.609.md?p=g).
  - (2) All passenger equipment shall meet the safety performance standards for suspension systems contained in [§ 299.609(h)](/cfr/49/299.609.md?p=h). In particular—
    - (i) **Vehicle/track system qualification.** All trainsets shall demonstrate safe operation during vehicle/track system qualification in accordance with [§ 299.609](/cfr/49/299.609.md) and is subject to the requirements of [§ 299.315](/cfr/49/299.315.md).
    - (ii) **Revenue service operation.** All passenger equipment in service is subject to the requirements of [§ 299.315](/cfr/49/299.315.md).
- (b) **Lateral accelerations.** The trainsets shall not operate under conditions that result in a steady-state lateral acceleration greater than 0.15g, as measured parallel to the car floor inside the passenger compartment.
- (c) **Journal bearing overheat sensors.** Bearing overheat sensors shall be provided on all journal bearings on each trainset.

## Notes

### Authority

Authority: 49 U.S.C. 20103, 20107, 20133, 20141, 20302-20303, 20306, 20701-20702, 21301-21302, 21304; 28 U.S.C. 2461, note; and 49 CFR 1.89.

### Source

Source: 85 FR 69731, Nov. 3, 2020, unless otherwise noted.