Light Rail Transit (Singapore)
The LRT lines are served by Automated People Mover rolling stocks, which were initially in a one-car formation. Due to higher passenger usage, most of the cars were joined together. The Bukit Panjang LRT Line started having 2-car formations when there was enough C801A trains ready for service, which the Sengkang and Punggol LRT lines started having 2-car formations around 2015. In 2-car formations, passengers cannot walk between cars, and people can only go to the other car by departing at a station and boarding the other carriage before the train leaves.