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 was the railway built as a single track?

A legacy of lunacy haunts Kenya's old railway. Will China's $3.6B line be different?
https://edition.cnn.com/2019/05/20/china/china-kenya-sgr-rail-africa-intl/index.html

I wonder why it was built as the single track railway. Considering it's capacity, it must have been built as double tracks.
Though it just operates 2 passenger trains and 9 trains per day, I guess the railway potentially has demand to operate 20 passenger trains. In this case, the single track can't afford to cope with such frequent trains.