地铁里的BJMTR是什么意思？

我在地铁里看到这个词，不知道是什么的缩写。

MTR, or Mass Transit Railway, is the rapid transit railway system in Hong Kong. The MTR first began service in 1979 and officially merged with the Kowloon Canton Railway (KCR) on 2 December 2007, still bearing the same name in English. The network includes 211.6 km of rail with 150 stations, including 82 railway stations and 68 light rail stops. The MTR system is currently being operated by MTR Corporation Limited (MTRCL). Due to its efficiency and affordability, the MTR system is a common mode of public transport in Hong Kong, with over 4 million trips made in an average weekday. The integration of the Octopus smart card fare-payment technology into the MTR system in September 1997 has further enhanced the ease of commuting on the MTR.

In 1967, construction of the MTR was prompted by a government-commissioned study. The Hong Kong Government had previously commissioned a study in the 1960s to find solutions to the growing traffic problem caused by the expansion of the city's economy.[3] Construction started soon after the release of the study, and the first line was opened in 1979. The MTR was immediately popular with residents of Hong Kong; as a result, subsequent lines have been built to cover more territory. There are continual debates regarding how and where to expand the MTR network.[4][5]

地下铁的英文是“subway”。 香港的地下铁的缩写是“mtr”，但到底它是什么的缩写。 “香港地铁”的词条，原来mtr是“masstransitrailway”缩写。 metropolis我在金山词霸上查到的意思是“首都,主要都市,都会,大主教教区,大城市”，古希腊“城邦”的意思，而且里面的“polis”是“政治politics”的源。 因为地铁都是在大城市里面的，是城市生活空间高度紧张的一个缩影，越是繁荣的城市，地铁线路越多，地铁的里程也越长。而郊区和乡村的铁路一般都是在地面的，不会在地下的。“masstransitrailway”更加体现了地铁在城市里面的庞大客流量。