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

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Why does it cost a lot to build subways in old cities?

Shatin – Central project faces 23% cost increase

It's the first time for me to hear that construction work has increased its expense, due to archeological finding in Hong Kong.
On the other hand in Kyoto, Japan, the city is suffering from accumulated deficit caused by skyrocketed construction expense , due to investigation of archeological findings underground.

It seems to be troublesome to build subways in historical cities.