There was little if any cooperation like that. The BART engineers were there own little tribe and let people know from up on high how things would go. This wa

There was little if any cooperation like that. The BART engineers were there own little tribe and let people know from up on high how things would go. This wasn't just the choice of gauge, it was everything about the design. In particular the collision avoidance system was conceived with very little input and took many years to sort out. The idea that BART engineers took input from Southern Pacific or anyone else has no supporting evidence and is counter to what is known about how they operated.