Wing after the opening of West Rail line). Two LRT routes were established, route 720 (now 751) to Yau Oi and route 721 Before Changed to (761) Then changed to (761P) to Yuen Long. West Rail The system remained essentially unchanged until the completion of the West Rail (now Tuen Ma line) in December 2003. Many changes were made, mainly around the new railway stations. The KCRC designed most railway stations in the LRT area to interchange with the new West Rail line. The idea was to encourage passengers to use the West Rail line instead of the Light Rail for longer journeys, thereby freeing up LRT vehicles for passengers making shorter journeys. For this purpose, an interchange discount system was launched with the introduction of the West Rail line system, meaning that passengers would pay no more (and in some cases less) to travel on West Rail line instead of the LRT for the main part of their journey. Although this most recent extension is the largest ever, no new vehicles were purchased. And although rearrangements were made, some infrequent and unreliable services resulted, causing passengers to blame the lack of vehicles and poor arrangement of new services. The KCRC has since modified the inside of some vehicles to allow more standing room for passengers during peak hours. They also made several route alterations to arrange them better. In addition to the reconfiguration of light rail tracks around the new West Rail stations, the system was extended to reach northern Tin Shui Wai to serve ongoing development there. Rolling stock The system's vehicles consist of five different types of LRVs. All LRVs are uni-directional with driving cab on one side only, 20.2 metres long and have 3 sliding doors fitted on the left side (when facing the running direction from inside). This means that island platforms (except the triangular platform at Siu Hong stop) cannot be used at all in the LRT system and the termini have to feature loops for LRVs to reverse in direction. Phase I LRVs were built by Comeng and put in service in 1988. They are numbered 1001–1070 and accommodate 43 seated passengers and 161 standees. The driver's cab interior and exterior design was conceived for KCRC by Design Triangle in 1986. Phase II LRVs were built by Kawasaki and entered service in 1992. They are numbered 1071-1090/1201-1210 and accommodate 26 seated and 185