May 17, 2005 - Activation failures, which involved train/motor vehicle collisions that occurred at highway-rail grade crossings equipped with active warning systems.

SA-2005-03 - Facilitates improved cooperation in the investigation of collisions at highway-rail grade crossings.

SA-2004-03 - Importance of restoring failed or malfunctioning highway-rail grade crossing warning systems to proper operation "without undue delay." This safety advisory supplements Safety Advisory 2002-01 issued on January 16, 2002, which addressed the importance of clear, precise, unambiguous railroad safety procedures to ensure the safety of highway-rail grade crossing warning systems or wayside signal systems that are temporarily removed from service.

SA-2004-02 - Importance of having clear safety and response procedures for use in the event of reports of railroad signal system problems.

SA-2002-01 - Importance of Clear Safety Procedures - Highway-rail grade crossing warning systems

SA-2000-02 - Recommended replacement of certain components in Harmon Industries'"Electro Code 4" and "Electro Code 4 Plus" intermediate signal units.

SA-2000-01 - Safety concerns involving Model B1 relays manufactured by General Railway Signal(GRS)