Diary of a rail fan in Kansai,Japan(Ver.2)

About world's rail news, general news, my train pictures, and travel diary)

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Why is this bridge movable?

https://en.m.wikipedia.org/wiki/Portal_Bridge

I didn't know that there is a movable bridge on North East Corridor, which is the busiest railway on Amtrak routes. Train runs at a 6 minutes headway. I wonder why the movable bridge still exists there.
It means all of the trains including Acela Express have to wait until a huge ship passes under the bridge.
It doesn't make sense in terms of train speed.
The bridge should be rebuilt as both of ship and train can pass at the same time.