Many of the "baby bullet" trains are slowed down by other trains on a daily basis. Some stations only get one stop per hour, even during rush hour, so those trains are overcrowded and can take minutes to make those stops. It's not uncommon to see a bullet have to come to a complete stop behind one of those trains. More cars should allow the passengers to exit the train faster, so that would counteract the impact of slower acceleration.
There are 4 (edit: looks like 5) unused Metrolink cars sitting in the siding at 4th and King. I don't know why they aren't being used on some of the busier routes.
There are 4 (edit: looks like 5) unused Metrolink cars sitting in the siding at 4th and King. I don't know why they aren't being used on some of the busier routes.