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I think we'll probably be using the normal 4ft 8 1/2 track gauge for a while yet, as it's backwards-compatible. Knuckle couplers are also likely to stick around. Interestingly the DB (German railways) have started fitting switchers with remote-controlled couplers - these units can hook up to cars fitted with standard European hook and screw-link couplers, and unhook, using controls either on the loco control desk or on a handheld control box. I think we'll see more ideas like this. <br /> <br />Trains speeds in the US may also go up - France, Germany, etc have all invested heavily in fast internal and international rail links to compete with air travel. I think as airspace becomes more crowded we may well see more trains like the Acela. Electrification may also make a comeback on long runs - it's easier to build fast electrics than fast diesels. Electric yard switchers using overhead power might also make an appearance - they'll make less noise and smoke, handy in urban areas with residents who don't appreciate the trains!
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