Following studies on the feasibility of urban applications of automated people mover systems as feeder transport in the 1990s, a Light Rapid Transit (LRT) line was built between Choa Chu Kang and Bukit Panjang and was opened in 1999. However, this LRT line was plagued with many problems such as damaged guide rails. The subsequent LRT lines built in Sengkang and Punggol in the early 2000s hence used the Mitsubishi Crystal Mover instead; said technology was also adopted for the Changi Airport Skytrain in 2007 to replace the original C-100 system when the system was renewed further expanded to serve the new Terminal 3. Several LRT systems were also planned for many other new towns but were either cancelled or planned as new MRT lines instead.