tributary to the line as well as to attend to the eventual neces- 
sities of the commerce. 
_ Art. 49. The construction and the concession for construc- 
tion of the roads of the second class may be made by the Union 
or by the States interested. 
Art. 50. The Minister of Agriculture is the proper person 
to construct or permit the construction of those Government 
resolves to carry into effect at the account of the Union, as well 
as to authorize the payment of the subvention of 15,000 mibreis 
per kilometer to those which were contracted for by the States. 
Art. 51. The technical conditions of the railroads of which 
Art. 45. treats in the second part, are the following: 
A portable line of the Decauville type. 
Weight of the rails, 15 kilos per metre. 
Gauge 0,60 cm between the rails, least radius of curvature 
40 M.O. 
Greatest incline OmO10. 
Weight of locomotives 18 to 20 tons. 
Art. 52. The concessions for these roads shall be let at a 
public bidding according to the rule established in law number 
1,126 of 1908, or independently of bidding with a person or cor- 
poration sufficiently able with the help of the payment of the 
maximum subvention of 25 contos per kilometer, according to 
the difficulties of the land it passes through, paid by sections of 
not less than 30 kilometers, completely ready and furnished with 
the necessary rolling stock, within 90 days of the date of the 
respective inaugurations. 
Art. 538. The concession for these railroads cannot be given 
to those who agree to build then simply as transportation en- 
terprises, but only to those who wili obligate themselves to 
colonize and explore, in proportion as they may be justified, the 
respective marginal lands. 
It is an essential condition for the validity of the conces- 
sion, that the contractor presents to the Minister of Agriculture 
within the maximum term of one year, proof that he has dis- 
posed of the lands for colonization, and a descriptive memo- 
randum of the character and extent of the industries he intends 
to develop. 
Art. 54. Those railroads of this type which in the future 
may be joined to any general line of transportation, shall be 
obliged as soon as its gross earnings amount to 10,000 mibreis 
per kilometer, to make its gauge conform to the same, and from 
then for all purposes becoming a part of the general federal 
transportation system. 
Independently of being joined to any railroad in general, 
these economical railroads shall pass to the jurisdiction of the 
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