Article 256 of Constitution of India "Obligation of States and the Union"
The executive power of every State shall be so exercised as to ensure compliance with the laws made by Parliament and any existing laws which apply in that State, and the executive power of the Union shall extend to the giving of such directions to a State as may appear to the Government of India to be necessary for that purpose.
Article 257 of Constitution of India "Control of the Union over States in certain cases"
(1) The executive power of every State shall be so exercised as not to impede or prejudice the exercise of the executive power of the Union, and the executive power of the Union shall extend to the giving of such directions to a State as may appear to the Government of India to be necessary for that purpose.
(2) The executive power of the Union shall also extend to
the giving of directions to a State as to the construction
and maintenance of means of communication declared in the
direction to be of national or military importance:
Provided that nothing in this clause shall be taken as
restricting the power of Parliament to declare highways or
waterways to be national highways or national waterways so
declared or the power of the Union to construct and maintain
means of communication as part of its functions with respect
to naval, military and air force works.
(3) The executive power of the Union shall also extend to
the giving of directions to a State as to the measures to be
taken for the protection of the railways within the State.
(4) Where in carrying out any direction given to a State
under clause (2) as to the construction or maintenance of
any means of communication or under clause (3) as to the
measures to be taken for the protection of any railway,
costs have been incurred in excess of those which would have
been incurred in the discharge of the normal duties of the
State if such direction had not been given, there shall be
paid by the Government of India to the State such sum as may
be agreed, or, in default of agreement, as may be determined
by an arbitrator appointed by the Chief Justice of India, in
respect of the extra costs so incurred by the State.