Nothing in sections 11 and 12 shall authorise—
(a)a railway administration of the Government railway to do anything on or to any works, lands or buildings vested in, or in the possession of, a State Government without the consent of that Government; and
(b)a railway administration of a non-Government railway to do anything on or to any works, lands or buildings vested in, or in the possession of, the Central Government or a State Government, without the consent of the Government concerned.