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Originally Posted by Innsertnamehere
Toronto's subway cars are actually wider than a typical metro train from my understanding.. IIRC when Toronto opened its subway in the 1950's the train cars were both the longest and widest globally.
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Based on the photos above and the information I could find online, I don't think that's true anymore. The pictures don't look any wider than the rolling stock used on the majority of Shanghai's metro lines, for example - and in fact, Shanghai uses the same basic model as the new Toronto Rocket (Bombardier Movia) on several lines.
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Longer platforms and trains could be another option no? Stations would be more expensive but that may not exceed the savings of a single bore.
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Yes, and in fact they are adding a few longer (7 car rather than 6) trains to line 8. Hopefully the issue should be resolved in a few year when more rolling stock is available (as there are still headway improvements to be made on both lines), but the problem today is that the rolling stock factories in China are already at full capacity due to the enormous number of metro projects in the country, which means that new trains are very difficult to get in short order.