Indiana Code Title 8. Utilities and Transportation § 8-6-2.1-31

Sec. 31. (a) In order to raise money to pay all bonds issued under section 29 of this chapter, including interest, the common council of the city shall levy each year a special tax upon all of the taxable property, both real and personal, located within the territorial limits of the special taxing district, in such manner as to pay the principal of the bonds as they severally mature, together with all accruing interest.

(b) The tax levied shall be collected by the county treasurer in the same manner as other taxes are collected.  As the tax is distributed to the controller or clerk-treasurer it shall be deposited in a separate fund, to be known as the grade separation or railroad relocation and reconstruction bond fund, and shall be applied to the payment of the special taxing district bonds and interest as they severally mature, and to no other purposes.  All accumulation of the fund prior to its use for the payment of the bonds and interest shall be deposited in the depository or depositories of other public funds in the city.