Actually the tendency to design trains with no public front-window viewing began back in the 1970's well before 9/11. The original BART cars never had a view and New York City subways were buying full-width cabs with little or no "see-through" back then too. The events of 9/11 only reinforced what was already being done anyway.
The only trains I know of in America where you can see out the front from a normal seated position are the Washington D.C. Metro (WMATA) and in Philadelphia, SEPTA's new Silverliner V, 120 car fleet. The original light-rail cars in San Jose, Calif. had it too, but their replacement fleet has a cab-door with no window, so no view at all.
Maybe I should move to Japan..............