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Quiet Zones


Based on federal rule, local government agencies may restrict the usage of train horns at railroad crossings which meet specified criteria.  The crossings are then considered to be within a "Quiet Zone".  On approach to such crossings train locomotives are NOT required to sound their horns.  The Commission’s Rail Crossings and Engineering Branch (RCEB) reviews notices of intent, establishment or continuation of Quiet Zones, and provides written comments to local authorities, focusing on safety concerns related to the potential for collisions between trains and the public.

The list of CPUC list of Quiet Zones shows that as of April 2013, there are: 

  • 36 Established FRA Quiet Zones (181 crossings)
  • 5 corridors with Wayside Horns (15 crossings)


In general terms, a Quiet Zone may be established after implementing safety improvements that provide the same level of risk reduction as would otherwise be provided by the train horn. A Quiet Zone can be one crossing in a community, or several consecutive crossings in one or more communities. A Quiet Zone can be created along corridors shared by both railroad and rail transit.

The Federal Railroad Administration (FRA) Train Horn Rule (49 CFR Part 222) became effective on June 24, 2005.  This rule provides a step-by-step process to determine what can be done to offset the lack of a train horn, to calculate the risk reduction associated with potential improvements, to formally document the silencing of the train horns and officially establish a Quiet Zone.

FRA website: For more complete information about the federal rule, visit the FRA website which has pages about the Train Horn Rule and Quiet Zones. 


A Quiet Zone does not require state approval, and any crossings meeting the safety criteria established by the federal Train Horn Rule will qualify.  Although the federal Train Horn Rule does not require state authority to establish a Quiet Zone, RCEB is required to receive and evaluate all notices of intent, establishment or continuation of Quiet Zones, and provide written comments.  The evaluation requires research and verification of data submitted under the rule, as well as a field diagnostic review of the crossings.

Under the Train Horn Rule, RCEB is required to participate in diagnostic reviews of crossings in the proposed Quiet Zone and makes recommendations for safety enhancements in lieu of the train’s sounding of their horn.   Some crossings will require improvements be implemented before the crossing will qualify for inclusion in a Quiet Zone.  Some may qualify as currently configured, however, RCEB or the other parties involved in the Quiet Zone review (railroads, FRA, roadway authority) may recommend further improvements be implemented before establishing the Quiet Zone.  Cities and Counties decide whether to implement the additional recommended improvements, but the crossing must meet the a number of requirements before a Quiet Zone can be established.  These include:

  • Federal Railroad Administration Train Horn Rule
  • California Public Utilities Commission General Orders
  • United States Department of Transportation’s Americans with Disabilities Act Standards for Transportation Facilities
  • California Manual on Uniform Traffic Control Devices (published by Caltrans)

Where modifications to a crossing are proposed by a local agency, RCEB will process the application to the Commission for authority to alter the crossing.  Authority to alter existing crossings must be obtained from the Commission, typically through the Commission’s General Order 88-B process.  For further information, see the GO 88-B web page.


Please use the following information to contact CPUC Rail Crossings and Engineering Branch regarding Quiet Zone notices, correspondence, or inquiries.

(1) For general inquiries relating to the Train Horn Rule, please contact the Quiet Zone Coordinator:

(Yen) Ken Chiang, P.E.
Utilities Engineer
Rail Crossings and Engineering Branch
California Public Utilities Commission
(213) 576-7076

(2) For Notices required under the Train Horn Rule:

Please address a printed copy to the Branch Manager. 

Please also send  electronic copies (PDF format preferred) to the Supervisor, engineer assigned to the County, and the Quiet Zone Coordinator.  To electronically submit files totaling more than 10 MB in size, please use the CPUC File Transfer site at

(a) Branch Manager

Michael Robertson, P.E., Manager
Rail Crossings and Engineering Branch
California Public Utilities Commission
320 West 4th Street, Suite 500
Los Angeles, CA 90013

(b) Supervisor

Provide an electronic copy to Anton Garabetian, P.E., Supervisor, Rail Crossings and Engineering Branch:

(c) Engineer assigned to the area

Provide an electronic copy to the appropriate field engineer. See the Rail Crossings Contact Information.

(d) Quiet Zone Coordinator

Provide an electronic copy to (Yen) Ken Chiang, P.E., Utilities Engineer:


Last Modified: 10/22/2014

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