USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Site Notification

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Addresses the importance of having clear safety and response procedures for use in the event of reports of railroad signal system problems

Document Series
Safety Advisories
Safety Advisory Number
Subject Signal and Train Control
Signal and Train Control; hazardous material; manually operated switch; switch points; gapped switch
sa2004_02.pdf (67.38 KB)

DOT is committed to ensuring that information is available in appropriate alternative formats to meet the requirements of persons who have a disability. If you require an alternative version of files provided on this page, please contact
Effective Date: Tuesday, August 10, 2004