The tariffs shall be revised every five years, the Minister of Public Works having power to reduce them in accord with the company; but in no case shall there be any right to advance the same beyond the maximum prefixed.
The application of the tariffs shall always be made on the basis of the most perfect equality, the company not being able to concede to any one any advantage which it does not give to all who are in the same circumstances. 6th. The mails shall be carried free, during the life of the concession.
7th. The companies shall be considered Mexican in all which concerns their relations with the government and the rights and obligations stipulated in the respective concessions.
8th. The Executive shall fix in the manner most convenient the terms of payment of the subsidies.
9th. The Executive, in making use of this authorization, shall not prejudice the rights acquired by the States in virtue of former concessions.
10th. The concessionary companies, in case they can acquire them, shall utilize the lines which have been constructed upon the route adopted by them. Otherwise they may construct parallel lines. In either event, they shall not receive more than the excess of their own subsidy above that of the line already constructed.
11th. The forfeiture of any concession having been decreed the nation shall acquire the ownership of the part of the way constructed free from all encumbrance and at a valuation fixed by experts named by the Executive and by the company.
From this valuation shall be deducted the amount of the subsidies paid to the company, and for the remainder the Executive shall emit obligations secured
