Who knows. You could say the same thing about every public transit agency in the country, if they'd been formed in the late 1940's instead of the late 1960's I'm sure a lot more streetcars would have survived. Although then again, New York took over public transit in 1940 and we still saw them abandon all streetcars and a good amount of elevated rapid transit.
I think that the only way in some alt-history narrative we avoid losing most of the railroads and streetcars in the US is if the US refuses to build the interstate highways. At least then, we'd have probably kept some of the passenger trains that as late as the 1960's were making money. And without losing the freight business to trucking, the railroads might not have collapsed and instead would have been able to start reinvesting in infrastructure.