Colo. Rev. Stat. § 40-21-102
It is the duty of said railroad company to keep and maintain at the place within this state where its said general offices are located the office of its president or vice-president, secretary, treasurer, local treasurer, auditor, general freight agent, traffic manager, general manager, general superintendent, general passenger and ticket agent, chief engineer, superintendent of motive power and machinery, master mechanic, master of transportation, fuel agent, and general claim agent; and each of its general offices, by whatsoever name known, shall be so kept and maintained at said place. This article shall apply to every person who performs the duties of any of said offices, by whatever title known, and the railroad company shall not be allowed to have any of the offices usually known as general offices at any other place than the place where it is required by this article to keep its general offices. Where the principal shops of any company are situated on its line in the state at a place other than the place where its general offices are located, the superintendent of motive power and machinery and the master mechanic, either or both, may have his office and residence at the place where such principal shops are located. The public utilities commission of the state of Colorado, where it is made to appear that any officer other than the general officers of any railroad company can more conveniently perform his duties by residing at some place on the line in Colorado other than the place where the general offices are situated, by order entered on its record may authorize any such officer so to reside and keep his office at such place.
C.R.S. § 40-21-102