Some Wide Bridges and High Volume Crossings in the World

https://bridgemastersinc.com/record-setting-bridges-across-the-globe

https://www.axiomint.com/built-wide-bridge-across-the-great-divide

Cairo: https://en.wikipedia.org/wiki/Rod_El_Farag_Axis_Bridge Has 12 lanes. https://www.guinnessworldrecords.com/news/2019/6/egypts-new-bridge-becomes-the-widest-cable-stayed-bridge-580736

Brisbane: https://en.wikipedia.org/wiki/Sir_Leo_Hielscher_Bridges They provide a 12 lane crossing.

https://en.wikipedia.org/wiki/George_Washington_Bridge It has 14 lanes. https://www.panynj.gov/bridges-tunnels/en/george-washington-bridge/history.html

https://en.wikipedia.org/wiki/Verrazzano-Narrows_Bridge It has 13 lanes. https://www.nydailynews.com/2015/10/06/bike-lanes-eyed-in-400m-overhaul-of-verrazano-bridge/

Since the early 1970s, the 10 lane San_Francisco-Oakland_Bay_Bridge is augmented in a way, by the Transbay_Tube. Indeed, 10 car BART trains cross the San_Francisco_Bay. Unfortunately, the BART tube wasn't designed to have a provision for a 3rd or 4th set of train tracks, so capacity is limited.

https://en.wikipedia.org/wiki/Eastern_span_replacement_of_the_San_Francisco-Oakland_Bay_Bridge Unfortunately, the Bay Bridge doesn't have anything like Sydney_Harbour_Bridge_cycleway as of yet.

The Sydney_Harbour_Bridge has 8 lanes and 2 tracks of the North_Shore_railway_line. The Harbour Bridge is augmented by the 4 lane Sydney_Harbour_Tunnel. On the other side of the Harbour Bridge is the Sydney_Metro-tunnel , https://www.sydneymetro.info/article/history-under-sydney-harbour , https://www.transport.nsw.gov.au/sites/default/files/media/documents/2017/tbm-fatcheet.PDF , https://www.abc.net.au/news/2023-04-21/sydney-metro-train-travels-under-harbour/102252872 , https://www.9news.com.au/national/sydney-news-train-goes-under-harbor-bridge-for-the-first-time-in-test/92d0ef56-3032-4416-a653-5b7c67dba002

https://en.wikipedia.org/wiki/West_Gate_Bridge Has 10 lanes.

https://en.wikipedia.org/wiki/Kingston_Bridge,_Glasgow Has 10 lanes.

https://en.wikipedia.org/wiki/Anzac_Bridge Has 8 lanes.

The new Port_Mann_Bridge in Canada was the widest for a little while. However, the bridge should have also had 2 rapidbus lanes and a provision for 2 rail rapid transit tracks. https://www.itsinternational.com/its1/feature/widest-bridge-world-port-mann-open-vancouver

The George_Massey_Tunnel was built to classic backward BC standards with only 4 lanes and no bus lanes and no breakdown lanes. While its replacement will have 8 lanes, there is no provision for rapid_transit. No emergency lanes and no provision for extra HOV & bus lanes. https://biv.com/article/2023/06/bc-starts-bid-process-41b-massey-traffic-tunnel

These 3 fine crossings were possible, simply because they aren't under any Vancouver, BC type restrictions and limitations. 

https://en.wikipedia.org/wiki/Narrows_Bridge_(Perth) ,WA: Has 10 lanes and 2 train tracks.

Seattle, WA: https://en.wikipedia.org/wiki/Interstate_90_floating_bridges An 8 lane crossing with 2 train tracks.

https://en.wikipedia.org/wiki/Champlain_Bridge_(Montreal,_2019-present), Quebec: It has 8 lanes and 2 train tracks. Stubborn BC will likely continue to not follow the examples of WA & Q.

At the other end of the spectrum is the inept, 3 lane Lions_Gate_Bridge. It just might be the best example of bottleneck planning on the planet. The Lions-Gate-Bridge is too narrow and flimsy to accomodate 2 bus lanes, especially any trains. Unlike Sydney, SF & Montreal in the 1930s, Vancouver was just a provincial backwater. Thus, the Lions_Gate_Bridge opened with just 2 lanes. A bridge so narrow that some living rooms and swimming pools are wider than it. The 3rd lane was squeezed in during the early 1950s. The Lions_Gate_Bridge would be fantastic as a bus, bike and pedestrian crossing. However, an 8 lane tunnel with a provision for a train line, should be built from the North_Shore to Georgia_Street. The section of Georgia-Street that's closest to Stanley_Park is 7 lanes wide. However, unlike most major cities, Vancouver deliberately keeps falling behind, because congestive or stunted planning is the way to go. 

Fortunately, the Vancouverism mentality didn't stop the Narrows_Bridge_in_Perth or Seattle's upgraded Interstate_90_floating_bridges and especially, the Champlain_Bridge_in_Montreal. (WA & Q)

https://thedigitallabyrinth.blogspot.com/search?q=trains