All corporations, municipal corporations, counties, companies, individuals, associations of individuals and their lessees, trustees or receivers, that:
(a) own, operate by steam, electric or other motive power, manage or control all or part of any railroad or interurban railroad as a common or for hire carrier in this state, or cars or other equipment used thereon, or bridges, terminals or sidetracks used in connection therewith, whether owned or operated under a contract, agreement, lease or otherwise.
(b) are engaged in the ownership, management or control of terminals in this state, which corporations, municipal corporations, counties, companies, individuals and associations hereby are declared to be common and for hire carriers, or the transportation of property within this state by express