The 91 Class is KTM’s first 6 car EMU, operating for ETS services. It is manufactured by Hyundai Rotem of Korea and Mitsubishi Electric of Japan. A total of 5 sets are currently in the fleet.
During the “Komuter Krisis” in 2012, some 91 Class EMUs were used as special “6 car Komuter” services operating on short-working KTM Komuter trips on busy sectors. This special service was ceased with the arrival of 92 Class EMUs.
The northbound and southbound directions are standard between Bukit Mertajam Junction and south of it towards Ipoh, KL Sentral and Gemas. If the train is travelling between the aforementioned stations and Padang Besar via Butterworth, the train will change direction at Butterworth.
Trains travelling through the Bukit Mertajam Bypass ie. not stopping at Bukit Mertajam and Butterworth are most likely not affected.
The train may also, in rare occasions, travel in the opposite direction ie. Coach A at the northbound end and Coach F at the southbound end.