N.Y. Real Prop. Tax Law § 489-gg

§ 489-gg. Ratio. The commissioner shall compute to the nearest\nthousandth of one percent a ratio for each railroad company by dividing\nits average railway expenses by its average railway revenues; provided,\nhowever, that if a railroad company shall have operated for less than\none full year prior to the first day of the year in which a tentative\ndetermination of a railroad ceiling for that railroad company is made,\nthen the ratio for that ceiling of that railroad company shall be one.\n