1. Like how the two lines cross the CP tracks now? Small tunnel for the CP track or elevated.
2. Congestion for trains? or cars? I mean there is Centre, 1st, 3rd, 4th street that cars can take, I don't see how a reduction in a few lanes on one of the the many streets will meaningfully degrade traffic.
3. Agreed this would be a problem, since the GL trains are incredibly long. I don't know the precise length of each street segment but I'd think some can still support a stop.
4. It would increase travel time of course, but we do a good job with lane reversals during rush hour, I can't see why we can't block off the lanes/left turns during high traffic times. And to cross the CP tracks part of it will still be tunnelled.
Ideally it'd be tunnelled, but compared to countless other larger cities that run surface transit routes effectively, not sure why one extra line would cause chaos and gridlock downtown. Travel times will be slower through the core, but most of the travel during peak times will be to/from downtown instead of through. Maybe you lose 5 minutes, or conversely lose years to driving or packed 301 busses because the line won't go remotely far enough. I can understand tunnelling portions of it, but I thought part of the high cost is associated with tunnelling from Eau Claire to Crescent Heights. Not sure why Eau Claire could not be a surface station then cross the bow elevated like the other CTrain lines.