The Safe Transit Accountability Act amends federal transit law to establish an "accountable executive" as the final decision-maker for public transportation safety committees. This executive will determine whether to implement risk-based mitigation or strategies recommended by the Safety Committee and serve as the sole tiebreaker in committee disputes. The bill defines this accountable executive as the single individual ultimately responsible for a transit agency's Public Transportation Agency Safety Plan and Transit Asset Management Plan. This person also controls the human and capital resources needed to develop and maintain these critical safety and asset management frameworks, centralizing authority for transit safety decisions.