B-B Diesel Hydraulic
These 30 former Chinese metre gauge type DFH21 locomotives were purchased second hand and were placed in service in 2006. They were originally built from 1977 so were hardly new when purchased! As the original Chinese machines had Chinese characters on the nose, it would be interesting to know why these units carry 'DFH21' on the front and yet 'D10H' on the cab sides. (Why go to all that trouble?)There are two types of these locomotives, some having a additional 'bulge' at the front, but apart from that appear to be identical. (see below) They are used mainly on the Western line for freight. There are several images available showing repainted locomotives in some sort of ceremony, with the year 2009 on the sign displayed next to them as well as the word 'caterpillar' painted on the long hood. Is this an upgrade using Caterpillar engines? Is there an intention to do this to all the members of the class?
These locomotives often appear in photos attached to Australian D5H class locomotives.
Click on thumbnails to view fullsize images
A Special Ceremony
In Chinese Service
Steam Locomotives generally used the traditional French classification system. A steam locomotive with a 2-8-2 wheel arrangement is classified as 141 class, a locomotive with 4-6-2 wheel arrangement is classified as 231 class etc. Pretty straight forward, except what did if two classes had a 2-8-2 wheel arrangement I'm not sure. It didn't happen so wasn't a problem?
Diesel locomotives have a completely dfferent clasification system.
All diesel classes start with the letter 'D' (for diesel?) then a number which I believe is related to the locomotives power output. The third character defines Electric' (E) or hydraulic (H).
e.g. D5H class = Diesel + 500 hp + hydraulic.
Again, what happens if two classes are the same I don't know.
I am still investigating pre 1975 classifications. Some are the same e.g. 141 steam class, and some are different e.g. 'BB' class instead of D9E.
Railways in Vietnam
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