OTOH, on my visits to Europe I am simultaneously impressed with the prevalence of passenger train options, but disheartened by the price. If Europe struggles to provide really affordable trains, there isn't much hope for the US. Aside from regional train options in the densest areas, we just have too much distance to cover. Infrastructure costs would kill the plan. At this point maybe we should just be trying harder to produce renewable fuels for planes.
As a tourist or outsider, the cost of trains in Europe is going to be much more expensive. In the Netherlands for example, the price of a train ticket without a subscription (such as for tourists) is very high; the price of a monthly subscription for free train rides outside rush hour is €130/month, which is way less than monthly cost of car use.