16. Any member of the Board and any investigator acting in virtue of this act may, on any day not a holiday, between eight hours and eighteen hours:(a) have access to any place where the public service or part of the service forming the object of an inventory or of an investigation is situated, make a full examination of the premises, work, rolling-stock and other property therein, and take cognizance of any books, plans, specifications, drawings and documents whatsoever that they may deem useful to consult;
(b) bring and utilize upon the premises the equipment and the instruments deemed necessary by them for their investigations and make use of those found there.