Harbin
subway (planned)
 
According to Jane's World Railways, Harbin (formerly known as Ping Kiang) has a 5.4 mile metro. No one who has lived in Harbin who I've spoken with appears to know of it's existence. An unfinished 9 km metro line has also been reported by Metropla.net. This would be in line with an article which reports a line to begin construction in 2003 which is based on "the original “7381” civil air-defense project of 10.1 km."  The report says the 24.6 km line could be opened as early as 2005.

Here, plans for a 17.3 km, 15 station LRT is shown, but not much else. Digital Harbin also presents a feature about an "existing 10.1 km, 5 station existing tunnel",  and a submitted proposal to  develop it into a 24.6 km, 24 station subway, including 18 stations for the 17.5 km main line (suspiciously similar to the light rail proposal) and 6 stations for the 7.1 km subsidiary line.

Metropolitan Railway Department
Harbin Municipal Council
City Administration Building
Harbin, China