N.H. Rev. Stat. § 365:22
Whenever the commissioner shall be of the opinion, after a hearing had upon his own motion or upon complaint, that any part of any railroad operating as a common carrier of passengers or freight within the state reasonably requires alteration or reconstruction, or that the regulations, practices, equipment, appliances or service of any such railroad in respect to transportation of persons or property within the state are unjust, unreasonable, unsafe, improper or inadequate, the commissioner of the department of transportation shall determine the reconstruction or alteration reasonably required, or the just, reasonable, safe, adequate and proper regulations, practices, equipment, appliances and service thereafter to be in force or to be provided, and shall fix and prescribe the same by order to be served upon every such railroad to be bound thereby.
RSA 365:22
1911, 164:11. 1913, 145:10. PL 238 :21. RL 287:21. 1951, 203:11 par. 22. RSA 365:22. 1985, 402:6, I(e)(3). 1992, 150:7, eff. July 5, 1992.