Locomotives and Multiple Units
All locomotives of the PT Kereta Api Indonesia(with the exception of steam locomotives for tourist trains in Ambarawa) are diesel-engined. Most new locomotives use electric transmission, while older and lighter ones have hydraulic transmission. A total of 451 locomotives are in the books, but the actual number of operational locomotives is smaller. A 2004 source mentions 374 operational locomotives. The oldest locomotive in the system dates from 1953.
The numbering scheme of locomotives dated from the Japanese occupation, using a combination of letters and numbers. A letter or a combination of letters is used to denote the wheel arrangement (currently there are C, D, BB and CC types), and a three-digit number is used to denote the class (20x for classes with electric transmission and 30x for classes with hydraulic or mechanical transmission), starting from 0. A two- or three-digit number shows the individual number, starting from 01.
Examples
- D301 70: the 70th member of the second class of D type diesel-hydraulic locomotive
- CC203 13: the 13th member of the fourth class of diesel electric locomotives with Co-Co wheel arrangement
The steam locomotive classification was directly derived from Japanese practice. Tank locomotives were numbered from the 10's, while tender locomotives from the 50's. Letter combinations were used for articulated locomotives (in the case of Indonesia these were Mallets).
Electric locomotives in Indonesia had always been a minority, and no new electric locomotives had been acquired in the last 70 years. However, electric multiple units have been imported from Japan and elsewhere since 1976. These are operated by the Jabotabek commuter transport division of the PT Kereta Api Indonesia, which has been spun off in August 2008.
May 2011: After changing the rail between Purwosari station and Wonogiri station and also the bridges with R42 (37 kilometers), so line between Srangkah station, Solo and Wonogiri will be served by heavy electric diesel locomotives.
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