Here are some thoughts I have on the recent fail grade of Bombardier's bid for the new streetcars.
Despite this being a huge deal, I haven't found anything since the early release of info saying that the streetcars would derail on corners because bombardier modeled the drivers slowing down more than the TTC did. [Surprisingly enough I can see how this would be a problem - I was convinced a westbound 505 streetcar on Dundas was going to derail today as it shot around the bend just east of McCaul. Why this is considered safe is beyond me.]
There were also rumors that the TTC required a streetcar be able to push another disabled car up and out of the portal on Queen's Quay at Bay. The idea is that if a streetcar dies in the tunnel, they need to be able to get it out. Both of these are separate issues that seem to be easily addressed.
There's no question that the TTC needs new streetcars. The ones that they have are old and dying, and even then they don't have enough to meet service demand, never mind growth.
It'd be nice to see all of the TTC's problems addressed, but there are a few things that need to be considered. The easier one is the broken down streetcar problem. As I've seen mentioned before, a simple cost-benefit analysis needs to be done: how much more expensive is a streetcar that can push another disabled streetcar out of the way, and how much is that going to cost at an aggregate level. There's a certain point where ordering a towing/pushing vehicle may be in order.
In terms of derailing, if it is a simple matter of speed - slow the cars down. There are not that many sharp turns on service track, except for maybe where the 504 and 505 turn on Broadview, and the 506 turns (twice) on Parliament and again at the terminals. [Don't hold me to that though.] A lot of people have started recommending serious track reconstruction, or limiting the new streetcars to certain routes. That does no good because the current CLRVs and ALRVs are on their way out anyway. So we would just end up with no streetcars on a lot of routes. I can't imagine where else the streetcars would run into problems though, and I'm not helped by the fact that the TTC still hasn't released what went wrong.
Someone needs to get their shit together so we can move past this.

