The train crosses the Thai-Malaysian border at Padang Besar before reaching the destination at the port city of Butterworth, which is opposite Penang Island, a resort island on the northern west coast of Peninsular Malaysia.
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Trains between Malaysia and Thailand (the International Express or Ekspres Antarabangsa, between Butterworth and Bangkok, and the Ekspres Langkawi, between Kuala Lumpur and Hat Yai) cross the border on the western branch of the Malay network at Padang Besar railway station.