Amtrak issues LoI for B&P Tunnel Replacement Program, US June 24, 2022 | News, North America News Amtrak has issued a request for a letter of interest (LoI) for the first of three construction contracts for the Baltimore & Potomac (B&P) Tunnel Replacement Program in Baltimore under a const... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password