Governments build highways and airports in order to drive growth that will increase tax revenues through more jobs and higher property values
The ironic thing is that one of the greatest factors that increases property value is
adjacent passenger rail service. (Note across the Delaware—despite the bellyaching over the "River Line", property values have gone up in the towns it serves.) Highways merely create urban sprawl (look at the Poconos and even the ABE area, well served by highways that everyone uses and airports that almost nobody uses, but with extant rail lines with no passenger service—a big mess)...and there is no job migration to the Poconos, existing industry in the ABE area that is not expanding...but the highest wages and greatest business expansion are still happening close to Philly.
The problem is that rail is very capital intensive and has high operational costs
Competing transportation modes have even greater capital intensity. However, they separate the transport vehicle costs from infrastructure costs while rail counts them all together. Per mile, rail is the real bargain infrastructure-wise, and has the potential to carry more passengers per mile, and at faster average speeds, than its competitors. Starting to see benefits yet...? Don't forget to look up at that catenary wire; that's another benefit.
I've heard the same argument a thousand times: give more money to rail and transit, and that will magically fix all problems
Magically fix...? No, I don't believe that's an accurate quote. And you've seen the results of underfunding for yourself. But when you
do apply the principle of increasing funding towards rail and transit, you
do get real-world results—and all one has to do is look overseas at what other countries have. Sorry, but it's self-evident.
You will have a more persuasive argument if you can frame it not in an ideological rail-vs-highway fashion, but in a rational manner with costs-vs-benefits and ROI
Rail advocates have been providing those for years and getting no results from those providing the funding. Care to offer another route for them to take?