Locomotive means a piece of on-track equipment other than hi-rail, specialized maintenance, or other similar equipment -
(1) With one or more propelling motors designed for moving other equipment;
(2) With one or more propelling motors designed to carry freight or passenger traffic, or both; or
(3) Without propelling motors but with one or more control stands.
49 CFR § 220.5
As used in this part, the term: