Conservation law, also called law of conservation, in physics, several principles that state that certain physical properties (i.e., measurable quantities) do not change in the course of time within an isolated physical system. In classical physics, laws of this type govern energy, momentum, angular momentum, mass, and electric charge.
On New Yearâs Eve, the Metrorail system will open at 7 a.m. with special extended service on all lines until 3 a.m. The additional three hours of service â consistent with past years â is a special exception to a moratorium on extended hours during the year-long SafeTrack maintenance program.
METRO does require that you have a valid light rail fare prior to boarding the trains. Valley Metro Rail will offer extended hours and capacity operating until 2 a.m. on January 28-31 and 11 p.m. on February 1 to support additional demand and late-night festivities.