You also have the matter of the Gadgetbahn advocate convienently neglecting to mention that most of the cost of a typical subway system goes into the cavernous

You also have the matter of the Gadgetbahn advocate convienently neglecting to mention that most of the cost of a typical subway system goes into the cavernous stations. They pretend the costs of a modern subway station is purely the cost per mile of tunnel, and that's the number they compare their pure cost per mile number to. So the subway cost per mile includes stations, while the Gadgetbahn cost per mile doesn't include anything other than tunnel boring. Certainly not the costs of each ludicrous car elevator.