accidental falls. Canada Screen doors are in use at all three LINK Train stations and the Union and Pearson stations along the Union Pearson Express route to Toronto Pearson International Airport in Mississauga, Ontario. In addition, platform screen doors are expected to be used in the light metro Ontario Line. Greater Montreal's forthcoming Réseau express métropolitain (REM), the 67-kilometre-long driverless complementary suburban rapid transit network opening in five phases between 2022 and 2024 will feature screen doors at each of its 26 stations. With the advent of the REM on the horizon, calls to retrofit platform edge doors in the Montreal Metro to combat delays arising from overcrowding are becoming more common. If full-height doors were to be installed, it may reduce the difficulty in opening station entrance doors at ground level due to the pressure imbalance caused by passing trains. Given that there are two different train door layouts on the Montreal Metro, with the older MR-73 trains having 4 doors on each side of the car, and MPM-10 having 3, it is unlikely platform doors will be showing up in the Montreal Metro until the retirement of the MR-73 fleet. Chile Platform edge doors are currently in use at Lines 3 and 6 of the Santiago Metro, being a novelty in the system. China All Chinese metro systems have platform screen doors installed on most of their lines. All stations built after the mid 2000s have some form of platform barrier. Only the Dalian Metro lines 3, 12, and 13, Wuhan Metro line 1 and Changchun Metro lines 3, 4, and 8 have stations without the platform screen doors on their early lines (). However many are starting the process of retrofitting these lines with platform screen gates. In addition, many BRT systems such as the Guangzhou Bus Rapid Transit are also equipped with platform screen doors. Platform screen doors are also present in some tram and light rail stops such as the Xijiao Light rail, Nanjing tram and Chengdu tram, as well as some bus rapid transit stops. Several underground high speed railway stations of the CRH network use platform screen doors set back from the platform edge. In addition, Fengxian District in Shanghai installed platform gates at a road crossing. Colombia Several stations on Bogota's TransMilenio bus rapid transit system use platform screen doors. Denmark The Copenhagen Metro uses Westinghouse and Faiveley platform screen doors on