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 does the train run at such high speed?

Caltrain’s first Stadler EMUs on test
https://www.railwaygazette.com/news/caltrains-first-stadler-emus-on-test/56632.article

I'm appreciated with the publication of EMUs used for Caltrain. I wondered why their maximum speed is 177km/h, while the current train on Caltrain Line is 127km/h. I guess there would be improvement of service times by raising maximum speed as well as faster acceleration.