Its 22.5 miles but its uphill most of the way
From a standing start it would be rather hard to get above 30mph on the bridge, once on the two track section the driver can put the foot down he would be able to put the power on a good ten seconds earlier than an enterprise since its a shorter train
Curiously commuter trains (70mph) are given the same time as the 90mph enterprise, the hill has a part to play in that, just because a train can do 90mph doesn't mean to can do it going up a hill at that speed.
The C3k is a very very powerful commuter railcar which gives it the ability to out accelerate everything except the DART, the price of course is in the fuel and capital costs
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