Md. Code, Public Safety § 3–406

(a) Each railroad police officer has all the powers granted to a peace or police officer.

(b) A railroad police officer may exercise the powers granted under this subtitle only if the railroad police officer:

(1) is on real or personal property owned, leased, operated, or controlled by the railroad company that employs the railroad police officer;

(2) is in fresh pursuit of a suspect;

(3) is requested or authorized to act by the executive officer or chief police officer of a county; or

(4) is ordered to act by the Governor.