Fun fact: In 1954 they also thought they could run the Yonge Line at 90 second headways. Thankfully they weren’t foolish enough to bet the future of the city on that delusionWhen the original Yonge Street Subway opened in 1954, they had expected that two-car Gloucester car trains would be used in the off-peak or Sunday service. Didn't turn out that way, they used four-car at minimum. Eventually settling with six-car and eight-car Gloucester trains.
Here's the similar chart on the City of Toronto website:I believe those are markings of power lines/gas lines to prevent damage if digging up the road for any work required. Not sure if this is relevant (see link) but red is electrical. My guess is this is where the TTC electrical lines are. https://www.alliancepipeline.com/SafetyEnvironment/Safety/Documents/UniformColorCodes.pdf
Indeed, there are a bunch of locations around the City where the TTC has strung (or undergrounded) power wires from one line to another. When aboveground, they can be easily made out as they use the TTC-standard steel poles rather than Toronto Hydro's.I believe those are markings of power lines/gas lines to prevent damage if digging up the road for any work required. Not sure if this is relevant (see link) but red is electrical. My guess is this is where the TTC electrical lines are. https://www.alliancepipeline.com/SafetyEnvironment/Safety/Documents/UniformColorCodes.pdf
Those different sizes are a result of different companies building the lines. Nowadays, they try to build all new lines (not extensions) to the BMT/IND specifications. There is absolutely no reason we should be changing sizes here.
But how many technologies must we have? No one wants to be SEPTA, who has to run 6 different train types to run their system. We're already at 5, do we really need a 6th?I think there's merit to different sizes (narrower, more articulation points, more of a modern signalling system if that does exist). Things gotta do some tight wiggling in a built environment, which a different train may be better at. But definitely equal - or longer - in overall train length to what we have now.