SACRAMENTO, Calif. (KGO) -- California's High Speed Rail Authority has cut planned capacity on the system by half.The authority says trains will run with fewer cars that originally proposed, 10 cars instead of 20 cars.That would allow station platforms to be shorter and construction on them to be cheaper.The authority also cut the maximum speed of trains inside tunnel sections from 220 to 200 miles per hour. Slowing the trains would allow for smaller tunnels, which are cheaper to construct.