Chinese Rail DF4B

The DF4B (4B) is a kind of diesel locomotive used in China. It was built by Dalian Locomotive &amp; Rolling Stock Works.It has been in production since 1984 and is still produced as of 2012.It is the most common locomotive in China and is used for both passenger and freight services.
Nickname.
DF4B is called "Armed Police" or "Watermelon" (freight version), and "Orange" (passenger version).
Manufacturers.
DF4B have been manufactured by several companies: