KTM Class 81

Class 81
A Class 81 EMU 14 Komuter train.
In service	1994 - Current
Manufacturer	Jenbacher Transport (designed by Hunslet TPL)
Number built	54 cars (18 sets) (14 sets retired and abandoned, 4 sets refurbished)
Formation	3 per trainset
Capacity	414 (224 seats)
Operator(s)	Keretapi Tanah Melayu
Depot(s)	Batu Gajah Rail Depot Sentul Komuter Depot
Line(s) served	Seremban-Pulau Sebang/Tampin Route Seremban-Pulau Sebang/Tampin-Gemas Route
Specifications
Height	3.65 m (12 ft 0 in)
Maximum speed	160 km/h (99 mph) (Design) 120 km/h (75 mph) (Service)
Weight	121 tonnes (119 long tons; 133 short tons)
Traction system	GTO-VVVF (HOLEC)
Electric system(s)	25 kV 50 Hz AC catenary
Track gauge	1,000 mm (3 ft 3 3⁄8 in) metre gauge

The Class 81 is the first and oldest type of electric multiple unit introduced by Keretapi Tanah Melayu for its KTM Komuter service. 18 sets were designed by Hunslet TPL and built by Jenbacher Transport and were delivered in stages. The class 81 currently operates in a fixed 3-car formation for its regular service. During the 1995-1999 period it used to operate at peak hours in a 3+3 car formation. But this configuration was soon discontinued. Briefly from 2009-2010, some of the train sets of this class were used in a hybrid diesel pull configuration in which an unpowered EMU would be towed by a diesel locomotive and while it gets electricity from an attached generator wagon.

The cars have features that resemble passenger carriages on existing intercity services, such as single-leaf doors, luggage racks and transverse seating. During the overhaul drive 2008, it was seen that a number of class 81's were refurbished such that there would be larger standing areas near the doors while enlarging the narrow bottle-necking corridors surrounding the doors. The Class 81 is now operated with a designated female coach at the middle (or second car) of the train set.

The KTM class 81 design is derived from the proven British Rail Class 323, with the main alteration being that it has single leaf swing-plug doors instead of a double leaf type.

The rolling stock consists of three versions of three-car EMUs added over the course of three years, beginning in 1994. The EMUs were the first in KTM's history. All Komuter EMUs operate in multiple-unit formation, running from overhead single-phase 25 kV AC 50 Hz catenary supply, with two driving cars and 1 - 3 trailer cars in between. The EMUs were state-of-the-art, with remote-controlled pneumatic doors, Automatic Train Protection (ATP), train data recorder, wheel-slip control, GTO/IGBT traction electronics and regenerative braking. Up to the point of their introduction no other KTM motive power used these modern train control systems.