No railroad company having an office or agency within this state shall refuse to put on sale or refuse to sell any ticket of any other railroad company with which the same may be directly or indirectly connected, at the price or rate fixed by the commission, for passage over lines of such connecting roads, less such amount as may be directed to be deducted from such rate by any one or more of said connecting lines. It shall be unlawful, after the sale of such ticket, to refuse to issue checks for baggage over such connecting lines, to the extent that the baggage may be allowed to be checked under the ordinary rules and regulations of said companies.