jonnhrr wrote:London like NYC has 2 different loading gauges, the subsurface lines (District, Metropolitan, Hammersmith and City, Circle) which were originally build to steam railway standards (and actually ran with steam power originally) and the "tube" lines which are smaller as they were early deep tunnels. Then there is the Waterloo and City which is a short 2 station shuttle between 2 key stations that has its own unique equipment. So different lines built to different loading gauges seems to be pretty common in the mass transit field, especially systems that have been around a while and with pieces built by different companies.
jwhite07 wrote:To my recollection there have never been any physical connections between what is now the Orange Line and either the Blue or Red lines
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