KTM Komuter is a commuter rail system in Malaysia operated by Keretapi Tanah Melayu (KTM). It was introduced in 1995 to provide local rail services in Kuala Lumpur and the surrounding Klang Valley suburban areas. Services were later expanded to other parts of Malaysia with the introduction of the Northern and Southern sectors. The service uses air-conditioned electric multiple units in 3 and 6 car formations. KTM Komuter contributed RM146.2 million to group revenue in 2017, carrying a total of 37.235 million passengers. The total number of passengers travelling with KTM Komuter in 2017 shows a decrease of 10.2%. This can be attributed to reduced service frequency due to the ongoing Klang Valley Double Tracking (KVDT) rehabilitation project. Network Current Network Central Sector KTM Komuter's 287 km (109 mi) network in the Central Sector mainly covers the Klang Valley. It has 53 stations. It consists of two cross-city routes, namely the Port Klang Line (Tanjung Malim to Port Klang) and Seremban Line (Batu Caves to Pulau Sebang/Tampin). Transfers between the two main lines can be made at any of the four stations on the central core: KL Sentral, Kuala Lumpur, Bank Negara and Putra. Same-platform or cross-platform interchange is available at Kuala Lumpur. The KTM Skypark Link from KL Sentral station to Terminal Skypark is a limited express service for passengers headed towards Subang Airport. To save time, it only stops at Subang Jaya The link is the second of its kind in Malaysia. The routes have been modified over the years. Previously, Seremban Line trains would head towards Tanjong Malim while Port Klang Line trains would head to Batu Caves. Following a successful trial, the routes were swapped. Trains from Seremban began heading towards Batu Caves, while trains from Port Klang headed towards Tanjong Malim. The service is subject to overcrowding during rush hours. Several steps were taken to alleviate this. Firstly, the operator introduced a new queuing system, in which the lines are painted on the floor with three colour codes representing each of the train set. Trains were also run in 3+3 formations, although this has been discontinued with the introduction of six-car sets. An express service from Seremban to KL Sentral is available during rush hour. Northern Sector The Northern Sector KTM Komuter Shuttle (Tren Shuttle KTM Komuter Sektor Utara in Bahasa Malaysia) service initially operated between Gurun in Kedah, Butterworth in Penang and Kamunting in