All problems of priorities and political will,
I disagree. I can see what is happening in my city right now. They want to expand the train service at one of the lines by adding a new track and you can't do that without stopping the whole service for months. They will provide buses as a replacement which will get stuck in traffic. There's no amount a political will that will magically expand train service without major disruption. Highway? You can make a detour or slow the traffic down. Airports? You can add entire runways without stopping the service. Trains are different. Trains are difficult.
Problems can occur with all means and you are just as trapped on a highway as in a defect train.
No one will prevent you from opening a window in a car or getting out to stand in some shade. You can't do that in a train. It's also way easier to tow a car than a train.