N.Y.C. Charter § 273: Section 273. Rapid transit sinking fund of the city of New York.

There is hereby continued the fund known as the "rapid transit sinking fund of the city of New York" which shall have for its purpose the amortization and redemption of all corporate stock of the city of New York issued on and after the first day of January, nineteen hundred ten, for rapid transit purposes, excepting that issued since the first day of July nineteen hundred eighty-one which is redeemable from the general sinking fund or any other sinking fund established pursuant to sections two hundred ninety through two hundred ninety-nine.