Quote:
Originally Posted by electricron
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?
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This is the only way to change gauge a little at a time, is the interim solution and later removal of the unused rails could be done a little at a time, say section-by-section.