The Mass Transit Railway Corporation designs, constructs, and operates one of the world’s most intensively used railway networks with 2.3 million passengers daily on 70 km of track. New railway construction is often undertaken in densely populated urban environments with high-rise developments surrounding works sites. For the Lantau and Airport Railway, operational in 1998, the Corporation had to remove 1000 m3 of granite 7 m from a high-rise residential estate for the construction of Lai King Station. A lightweight noise enclosure was erected but not without significant noise and political impacts. However, the station was successfully completed on time and within budget. Current extensive modifications to Mei Foo Station 15 m from residential towers require a heavyweight noise enclosure to include vehicular emergency service access. The construction method was developed to minimize noise impacts. The skeleton of the enclosure is now in place and there have been no significant environmental problems. This presentation will detail the following: the analysis methods used in determining noise impacts; the structure and training employed within contracts to obtain compliance to the noise specification; and the manner in which the noise impacts are monitored and controlled.