The West Coast Line runs from Padang Besar railway station close to the Malaysia–Thailand border in Perlis (where it connects with the State Railway of Thailand) to Woodlands Train Checkpoint in Singapore. It is called the West Coast line because it serves the West Coast states of Peninsular Malaysia.
The 1,151-kilometre line is busier than the East Coast Line because the West Coast Line handles a variety of passenger train services such as the various KTM Intercity services, the International Express, the KTM Komuter in the Klang Valley, Greater Penang and freight trains.
The major stations on the line include KL Sentral in Kuala Lumpur, Butterworth railway station in Butterworth, Penang and JB Sentral in the south.
The West Coast Line consists on the main trunk line from Padang Besar to the Woodlands Train Checkpoint in Singapore.
It also consists of several branch lines from this trunk, namely:
Branch lines where the tracks exist but are not used for any service are:
The West Coast Line connects with the State Railway of Thailand at Padang Besar, while the East Coast Line branches off at Gemas.