January, nineteen hundred and thirteen, and not included in the expenditure referred to in the last preceding paragraph, unless it can be shown that such expenditure has not enhanced the value of the undertaking; and
(c) such allowance as appears to the rates tribunal to be reasonable in respect of capital expenditure (not being less than twenty-five thousand pounds in the case of any work, and not being capital expenditure included in paragraph (a) ), on works which enhance the value of the undertaking, but which had not at the beginning of the year nineteen hundred and thirteen become fully remunerative:
Provided that, in determining the sum which charges will, with efficient and economic working and management, yield, the tribunal shall, with a view to encouraging the taking of early steps for effecting economies in working and management expenses rendered possible by or in anticipation of amalgamation, take into consideration the economies effected by such steps already taken, and shall make such allowance in respect thereof as the tribunal may consider fair and equitable to an amount not exceeding thirty-three and one-third per cent. of such economies.
(2) The tribunal when fixing charges in pursuance of the provisions of this section shall have regard to the means which in their opinion are best calculated to ensure the maximum development and extension in the public interest of the carriage by railway of merchandise and of passengers and their luggage, and shall accordingly ascertain as far as may be practicable the effect which the existing charges, or any of them, have had upon the merchandise or passenger traffic to which they are applicable, and in particular whether the application of such charges has, tended or, if continued, would be likely to tend towards causing the increase or diminution of the said traffic.
(3) If on any such review as is mentioned in the next following section it appears to the rates tribunal that the allowance made under paragraph (c) of subsection (1) of this section was too high or too low, the tribunal may revise the allowance and make such adjustment in the amount of the standard revenue as may be necessary.
