CA Pub Util Code Section 7805

The city governing body, in granting the right of way to a street railroad corporation, in addition to the restrictions which they are authorized to impose, shall require a strict compliance with the following conditions, except in the cases of prismoidal or other elevated railways:

(a)

The railway shall be constructed in such manner as will present the least obstruction to the freedom of the streets on which it is erected.

(b)

The tracks shall not be more than five feet wide within the rails, and shall have a space between them sufficient to allow the cars to pass each other freely.