China Railway DF4
0China Railway DF4, by Wikipedia https://en.wikipedia.org/wiki?curid=10091576 / CC BY SA 3.0
#Diesel-electric_locomotives_of_China
#Diesel-electric_locomotives_of_North_Korea
#Co-Co_locomotives
#Co-Co+Co-Co_locomotives
#A1A-A1A_locomotives
#Railway_locomotives_introduced_in_1969
#Standard_gauge_locomotives_of_China
#Standard_gauge_locomotives_of_North_Korea
#CRRC_Qingdao_Sifang_locomotives
#CSR_Ziyang_Locomotive_Co.,_Ltd._locomotives
The DF4 （Chinese: 东风4） is a type of diesel-electric locomotive used in the People's Republic of China.
It has been in production since 1969 and is still produced as of 2007 by several local companies.
It is the most common locomotive in China and is used for both passenger and freight services.
The first DF4 was built in 1969 in Dalian.
The first 108 locomotives that were built here are the original DF4s using the 16V240ZJ engine.
It took seven years to build all 108 locomotives of this type.
Due to unstable technique in the production of early-built DF4 locomotives, malfunctions of mechanic and electric parts occurred frequently during the operation, especially the diesel engine.
Thus, most DF4 locomotives were taken out of service for maintenance, and railroad engineers from Fengtai Locomotive Depot sarcastically joked that the DF4 "can't make it from Dongdan to Xisi".
Therefore, Dalian Locomotive Works introduced 16V240ZJA, an improved diesel engine.
They are nicknamed "Watermelon".
Few of the first series DF4 are still in operation, however the first ever is a permanent exhibition at the Beijing Railway Museum.
The DF4A distinguishes itself from first series DF4s with an improved engine, the 16V240ZJA. Production started in 1976 （the first model being DF4-0109） and lasted until 1984.
The DF4A designation is unofficial.
Nicknamed "Watermelon", "Armed Police", or "Orange".
Generally speaking, "Watermelons" and "Armed Police" versions are used for freight, while "Oranges" are almost used for passenger services.
DF4B are very similar to...
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