Ind. Code § 8-4-1-20
A railroad may, from time to time, borrow such sums of money as they may deem necessary for completing or operating their railroad, and issue and dispose of their bonds for any amounts so borrowed, for such sums, and at such rate of interest as is allowed by the laws of the state where such contract is made, and mortgage their corporate property and franchises to secure the payment of any debt contracted by the railroad; and the directors of the railroad may confer on any holder of any bond issued for money borrowed as aforesaid the right to convert the principal due or owing thereon into stock of said company, at any time not exceeding fifteen (15) years from the date of said bond, under such regulations as the railroad may adopt; and the railroad may sell their bonds, either within or without this state, at such rates and prices as permitted by law, and such sales shall be as valid as if such bonds should be sold at par value.
IC 8-4-1-20