bro, you're not fitting 625 people on 4 train cars, much less 1000. heavy rail passenger cars can fit ~135. commuter rails can fit 150 so that'll get you close, but these are only viable in and around cities. also you can't expand these cars because the longer (and higher) the car, the easier it is to derail. you can make them wider, but only by a few feet and at the cost of however many $trillions we'd have to spend widening the rails and row. op can suck my sweaty taint.
United States