Like this

Whenever I think about the SBT I try and imagine it as a real place. What is it like? Here is an idea of what it could be

Now granted it won't be passenger cars, but I can see and hear the #3 slipping as it shoves hard against a cut of cars. Blowing for the 15th Ave crossing as the flagman stands guard. It will be quite the sight. At least in my minds eye.