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The Surface Transportation (ST) and Public Transportation & Over-the-Road Bus (PT & OTRB) Information Sharing & Analysis Centers (ISACs) are one-stop clearinghouses for information on threats, vulnerabilities, and solutions to physical and cyber infrastructure security. The ISACs support improved situational awareness, produce original analysis on important security and safety-related topics, and provide an efficient means for their members, critical infrastructure partners, and the government to send and