Indonesian Railways Class BB302

The BB302 is a class of diesel-hydraulic locomotives built by Henschel in West Germany for the Indonesian State Railway (PNKA) and entered service in 1970. All units of BB302 class were allocated to North Sumatra.

Design and description
The BB302 class has a length of 11200 mm, width of 2800 mm, and height of 3690 mm. It weighs 44 t. Its maximum speed is 80 km/h. The class were originally powered by a Maybach Mercedes-Benz 12V 493 TZ10B diesel engine with 900 hp. In 1998–2000, midlife overhaul program was carried out on all units to increase the power to 1000 hp by replacing the original engine with an MTU engine. It rolls on a B′B′ axle, with two bogies, each of which has two drive shafts connected to each other. It is usually used to pull passenger trains or freight trains, including for shunting.

The BB302 class is part of the Henschel DHG1000BB series, which also includes the BB303 class. This locomotive class were visually indistinguishable with the later BB303 class, with the major difference being the weight, as the BB302 are slightly heavier than BB303. Other difference are the control stand for BB302 is located on the right-hand side of the cab. Early in its service, the BB302 also used spoked wheels, which were later replaced by the more common solid wheels.

History
The BB302 class is a unique locomotive because it is endemic to North Sumatra, the only place it operates, with only 6 units. The BB302 class entered service in 1970. It was introduced there to augment the BB300 class as part of locomotive modernization program to replace the steam locomotives.

Over the years, the BB302, together with its siblings namely the Henschel-built BB303 and BB306 classes dominated the railways in North Sumatra as a universal locomotive for hauling passenger and freight trains. Initially, the BB302 locomotive used the Maybach Mercedes Benz type 	MB 12V 493 TZ10B engine.

After 25 years of operation, this locomotive class was rehabilitated by changing its engine to an MTU diesel engine. The rehabilitation was carried out in 1998–2000 (along with the BB303 in North Sumatra).

With the arrival of BB203 and CC201 in North Sumatra, the role of the BB302 locomotive shifted. BB302 were assigned for short to medium distance trains, and later only used as shunters. As of 2021, only 1 out of 6 BB302 units are serviceable.

Allocations
The BB302 70 01 is the only remaining BB302 locomotive at the Medan depot which has the PJKA's distinctive yellow-green livery. The BB302 70 06 was declared unfit for hauling duties, and later used only as a shunter at Pulu Brayan workshop, also using vintage livery. The rest of the class were declared unfit for service.