In one word... greed.
It always starts at the greedy suppliers up to the regulators.
Trains... yet another 1st world thing that the US doesn't seem to be capable of doing right.
I guess that car dependence in the US is so great that trains don't get the funding they deserve?
You knew this CalTrans system was doomed because the day after they turned on the electrics, they were immediately making noise about its efficiency in the press. Before they even had real data supporting their press. It was all about pumping the taxpayers to get the funding.