Section 21.04 - Railroad Rolling Stock(a) A portion of the total market value of railroad rolling stock that is appraised as provided by Subchapter B of Chapter 24 of this code is taxable by each county in which the railroad operates.(b) The portion of the total market value that is taxable by a county is determined by the provisions of Subchapter B of Chapter 24 of this code. Amended by Acts 1983, 68th Leg., p. 4823, ch. 851, Sec. 9, eff. Aug. 29, 1983 Acts 1979, 66th Leg., p. 2247, ch. 841, Sec. 1, eff. Jan. 1, 1982.