Since Reno was mentioned I feel it's important to note that Reno is better than Vegas in every way, and will probably have functional, reliable mass transit before Vegas too. NVDOT has studied commuter rail there a few times, it probably wouldn't work but helps the state figure out the cost of a proper Capitol Corridor extension or equivalent. A modern Donner Pass Tunnel was needed a century ago, eventually California will just build it and Reno will join the Sacramento Metro Area.
https://www.pctpa.net/rail-capitol-corridor>In 2023, Caltrans completed a Project Study Report (PSR) that studied the feasibility of expanded passenger rail service to Reno and outlined necessary station improvements. This was supplemented by a First/Last Mile Analysis Report prepared by PCTPA that looked at current and future first/last mile connection needs at seven station sites along the corridor. Planning for expanded passenger rail service to Reno continues with CCJPA and partner agencies along the I-80 corridor in Placer, Nevada, and Washoe Counties. https://www.sacbee.com/news/local/transportation/article267915022.htmlEventually, Caltrans and Nevada will work something out to get reliable daily train service between Reno and Sac.
