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It all comes down to cost when we consider any change from standard. Just look at the work and costs going into the unit trains with electronic brakes. They are not readily interchangable with the tried and true air brake system that was first espoused by Westinghouse. Look at Europe with its link and pin couplers. They want to convert to knuckle but have not done it because of cost. And Europe's rails are government owned and we all know that government seems to have bottomless pockets of money. Some of the newer passenger train sets in Europe are now equiped with knuckle couplers which tells me they are superior to the link and pin (really hook and come along). All it takes is money. <br /> <br />I believe the reason that Montreal went with the rubber tire system is that it is a French product and we know how the residents of Quebec want to be Frenchmen. To my knowledge only Paris and Montreal have the rubber tire metros. By the end of the day the subways in both cities smell of overheated rubber. They had to go to a non steel belted tire as when a steel belted tire would disintegrate the steel bands would short out the electrical system. All I can suggest is to buy Michelin stock, the French tire company. They certainly go through a lot of tires.
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