THE RAILWAYS ACT, 1989 – Chapter IV(A) – Section 20(B)

20(B) Power to Enter for Survey, etc.
On the issue of a notification under sub-section (1) of section 20(A), it shall be lawful for any person, authorized by the competent authority in this behalf, to:-

(a) Make any inspection, survey, measurement, valuation or inquiry;
(b) Take levels;
(c) Dig or bore into sub-soil;
(d) Set out boundaries and intended lines of work;
(e) Mark such levels, boundaries and lines placing marks and cutting trenches; or
(f) Do such other acts or things as may be considered necessary by the competent authority.

Forward reference⇒Section 20(C)