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Dokument ten chciałbym szczególnie polecić budowniczym warszawskiego metra.
Część 2 dokumentu, 3, 4 i 5.

“Underground Iron – The Building of a Railway” was a documentary of Hong Kong Mass Transit Railway Corporation (MTRC), reviewing the building background, process and benefit of the initial system of MTR. This original documentary was released in 1986, the time frame was longer than Cantonese version which played on TV channels.