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FYI, Bombardier's technology is not cheap, being proprietary, it can only be sourced from them. At least conventional electric train parts can be sourced from many many more suppliers.
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LIM propulsion is not proprietary and there are several companies with offerings in 3 countries around the world, with a fourth offering from a company in India under development. Bombardier does not own any part of "SkyTrain technology" except for the patented steerable bogie design.
You can retrofit LIM onto tracks on a gradual basis without causing a service disruption. A Japanese study on LIM propulsion systems - these took hold in Japan in the 1980s starting with Osaka and continue to with Sendai's new subway line in 2015 using LIM propulsion - made note of the potential to gradually upgrade existing subway lines to be compatible with LIM stock, while running the normal trains, and then using the LIM stock when ready, which'd be useful when those subway lines need to be expanded as you could then save costs with smaller tunnel builds.
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From study: Although they say the LIM driven car is possible only for the adoption in a complete new line, introduction in existing lines is also possible. For example, if reaction plates could be laid on existing lines, both use of the rotary induction motor and LIM would become possible and could replace the conventional car gradually with the LIM driven car. Of course for this purpose, the advantages of LIM driving system must pay back the cost of laying reaction plates. This is our earnest hope along with development of the LIM drive system. Though we had only about 8 years' experiences, we will continuously cooperate with the diffusion and the development of the linear motor subway from now on.
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At the moment I'm pretty sure that none of the major subway lines in Tokyo or elsewhere are in need of rolling stock replacement, which is probably why this isn't being done.
See:
SkyTrain-type technology clearly a winner in Japan (link in article)
To provide a capacity comparable to the Expo/Millennium/Evergreen Lines, extending the stations beyond 50m won't be necessary due to the 3.2m car width compensating. Bombardier's Innovia Metro IS offered in a 3.2m option (this car width is actually used in Beijing and at the New York-JFK AirTrain. I rode the latter this December and I can confirm that the cars are about Canada Line-width). The supplier for Guangzhou's LIM Metro system also builds at 3.2m I think.
I really only see one potential issue here and that is train height - because LIM propulsion trains are generally lower than the Canada Line's platform height.