Quote:
Originally Posted by Myrtonos
One way to convert, when a fleet is renewed is to provide the network with dual gauge track while the old non-standard fleet and the new standardized fleet shares tracks, but dual gauge track is not always possible.
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This may work well on dedicated railroad corridors, but unlikely with light rail or tram lines in the middle of city streets. Taxpayers will be more willing to take the construction delays for a permanent solution, but I doubt they will be willing to accept those delays twice - once building the interim solution adding the third rail, and again later on removing the unneeded rail after all the old trains have been replaced. There is already too much highway congestion - why make it worse twice?