> True. Didn't the original air bags on the Pullman Superliner I's Amtrak ordered exploded because of how much they bounced on horrible 70's track, including the shitty maintenance performed on many Class 1's, including Penn Central?

Then why do the Superliner IIs, which have the GSI trucks, ride better on the same "horrible" track?

> Surely, Caltrans and IDOT should call Stadler, after Nippon was an epic fail for their intercity bilevels...

Nippon's cars weren't what failed; it was the cab car cab module which failed the collision test. This is a crew protection thing which also applies to locomotive cabs. Since most of the bi-levels don't have control cabs, they're still OK to build new. Nippon decided the throw in the towel on both the cab cars and the straight coaches. Any other carbuilder is free to build the coaches, and if they could come up with a cab module design which passes the collision test, they could build those too.