03-15-2017, 12:22 PM
I think a big part of it is the fact our line can't have any superelevation (banking) due to the geometry of the trains. The curve geometry along the line coupled with the acceleration capabilities also severely limits it in the downtown areas. Fixed bogie is fine for curves but not curves+speed. Articulated bogie (San Diego) is great for speed but not so much for tight curves where you have a much longer car body.