ARTICLE 92
The national railroads, irrespective of the incorporation of their budget and accounts in the general budget and accounts of the Commonwealth, shall be administered as an independent economic enterprise which shall defray its own expenses, including interest and the amortization of the railroad debt, and accumulate a railroad reserve fund. The amount of the amortization and of the reserve fund, as well as the purpose to which the reserve fund may be applied, shall be regulated by special law.