Minn. Stat. § 219.455
(e) "Terminal" means a facility or station where:
(g) "Yard track" means a system of tracks within defined limits used for:
(3) other related purposes over which movements not authorized by timetable or by train order may be made subject to prescribed signals, rules, or other special instructions.
Sidings used exclusively as passing track and main line track within yard limits do not constitute yard track.