(1)    Office of the commissioner of railroads. There is created an office of the commissioner of railroads which is attached to the public service commission under s. 15.03, provided that s. 85.02 (1) does not apply to the office of the commissioner of railroads. The commissioner of railroads shall have expertise in railroad issues and may not have a financial interest in a railroad, as defined in s. 195.02 (1), or a water carrier, as defined in s. 195.02 (5). The commissioner may not serve on or under any committee of a political party. The commissioner shall hold office until a successor is appointed and qualified.