A group of Marines swarmed two Metrorail cars on Wednesday morning searching for evidence of a chemical or biological attack. Then they had lunch.

It’s a scene that plays out on a regular basis at Metro’s makeshift training site at the Carmen E. Turner Maintenance and Training Center in Landover. More than 8,000 regional police, fire, medical and military personnel have been trained at the facility since it opened in 2002, and the agency has had training requests from as far away as Malaysia, said Fred Goodine, assistant general manager for system safety and risk protection.