Japan National Railways (JNR)
developed a new diesel locomotive for shunting and feeder line, DD20, which
was equipped with a 1000PS diesel engine, as the successor of DD13 which
was equipped two 500PS diesel engines. But JNR found out that it was difficult
to deliver DD20 to feeder lines, since axle weight was same as DD13, and
DD20 was unsuitable for shunting use, since adhesion was insufficient. In
1966, JNR developed DE10 type diesel hydraulic locomotive, the axle weight
of which was reduced, and which secures enough adhesion. All axles of DE10
are driven. Although one bogie looks like 3-axle bogie, since each axle is
connected by the links and each axle can move freely, it can reduce lateral
force.
The engine is DML61ZA, which is improved on the engine of DD51. Output is improved to 1250PS. DE10 adopt hydraulic transmission gear;
DW6, which is improved on DW2 of DD51. At first DE10 was equipped with
the steam generator, but later the other type of DE10 omitting SG appeared.
Sub types are shown as below;
| -sub type |
SG |
engine type |
output |
bogie
|
| -0 |
fitted |
DML61ZA |
1250PS |
DT131/DT132 |
| -500 |
not fitted |
DML61ZA |
1250PS |
DT131/DT132 |
| -1000 |
fitted |
DML61ZB |
1350PS |
DT131/DT132
or
DT131/DT141 |
| -1500 |
not fitted |
DML61ZB |
1350PS |
DT131/DT132
or
DT131/DT141 |
DE10 type diesel locomotives were decommissioning by decreasing
freight trains and spreading electrified lines. In additional DE10 becomes
too old to use, so we have to take notice of future DE10.
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