Most reciently under Homeland Security:Unless the new M7's are packing some sort of artillary, and there's a bunker under Ronkonkoma yard, that doesn't mean you know what to me!
USC Title 6 - Domestic Security
Chapter I - Homeland Security Organization
Subchapter II Informational Analysis & Infastructure Protection
Part B Critical Infastructure Information
Under this law the Director of Homeland Security has established the Long Island Railroad a "Critical Infastructure" in November 2003.
This designation only duplicated the restrictions imposed in the meeting of the Transportation Security Oversignt Board, February 2002 as established by
USC Title 49
Subchapter I - Department of Transportation
Chapter 1 - Organization
Sec 115 - Transportation Security Oversight Board
Now these restrictions are nothing new. Traditionally, (at lease since WWII days,) Title 50 was applied against photographers.
USC Title 50 - War and National Defense
Chapter 4A - Photographing, sketching, Mapping etc Defensive Installations.
While major parts of this law were repealed in 1948, those restricting photographing were not. Much case law established Transit Systems, Railroads, etc as "defense installations," extending these restrictions to them. After the recient decisions under Title 6, there now stand a myrid of federal laws under which a photographer of railroad installations can be prosecuted.
Correct me if I am wrong, but that sounds like it only applied to troop trains a real long time ago?