N.Y. Railroad Law § 238

§ 238. Increased deposit, when and how required. In case any of the\nsecurities deposited in lieu of money as provided in section two hundred\nand twenty-five, shall in the opinion of the county treasurer or trust\ncompany with whom they may be deposited, fall below their actual value\nat the time of deposit, the county treasurer or trust company shall call\nupon such railroad corporation to substitute therefor other securities\nequivalent at their par or market value to the amount in lieu of which\nthe securities for which they are to be substituted were deposited, and\nin case such other securities shall not be furnished, the county\ntreasurer or trust company shall call upon such corporation to furnish\nas a substitute, and it shall so furnish an amount of money equal to the\namount in lieu of which the securities first above referred to were\ndeposited.\n