Being courteous does solve that...? First off, trains don't share the road, they follow tracks, so thats somewhat of a convoluted comparison. But more importantly, you stop at train crossings so the train can go first...? Is your argument that that's inefficient? Everything is inefficient. Any solution to a really complicated problem like how multiple forms of transportation co-exist is going to have inefficiencies

Also, no idea where you got the idea that I would be opposed to building more rail and less cars? Cars should increasingly be de-prioritzed in favor of bikes, ebikes, and public transit, but bike riders should be courteous of those who are driving and vice versa, and cars should continue to stop at train tracks to allow trains to go by. Where on earth did you get the idea that my logic of "be considerate of those who are using a different means of transportation" means cars should go away or that cars shouldn't go away? Also we definitely should be building rail, if we're gonna deprioritze cars we need public transportation to help fill that gap for people who aren't in a position to commute or travel by bike/ebike, but all of our infrastructure is currently built around cars, and even in a distant future there will be a need for cars in addition to bikes and trains, we just have way too many of them

I don't mean to come across as rude, but your response to my comment honestly does really confuse me.

Be respectful of those you share the road with. That means driving in a way that's safe for cyclists. That means letting cars go by (when safe to do so) when you're cycling since they travel much faster than you. And definitely stop at train tracks so that trains can go by.