(a) Funds made available pursuant to subdivision (b) of Section 99315 shall be appropriated to the department for allocation, as directed by the commission, to fund public transit capital improvement projects that maintain or improve public transit service.
(b) Funds made available for capital outlay pursuant to subdivision (a) of Section 14031.6 of the Government Code and subdivision (a) of Section 99315 shall be appropriated to the department, as directed by the commission, solely for capital outlay improvements and rolling stock on intercity rail passenger routes.
(c) The Legislature may amend this section, by statute passed in each house of the Legislature by rollcall vote entered in the journal, two-thirds of the membership concurring, if the statute is consistent with, and furthers the purposes of, this section.