All companies owning, controlling, or operating lines of express or telegraph which are in whole or in part in this state shall be under the control of the commission, which shall have full power to regulate the prices charged by any such company for any service performed by such company. All the powers given to the commission over railroads in this state and all the penalties prescribed against railroad companies are declared to be of force against companies owning, controlling, or operating lines of express or telegraph and doing business in this state and whose lines are in whole or in part in this state, so far as such powers and penalties can be made applicable thereto. The commission shall also have power and authority to require such companies to locate agencies at railroad stations.