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Second D10H/DFH21
B-B Diesel Hydraulic

D10E
These 30 former Chinese metre gauge type DFH21 locomotives were purchased second hand and were placed in service in 2006.They are similar to Chinese standard gauge locomotives. 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 an 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.

D10H002
DATA
Gauge
1000 mm
Class
D10H
Manufacturer
Sifang, China
Built
1977
Introduced in VN
2006
Model
DFH21
No. in Class
30
Road Numbers
001-030
Engine
v12 180ZJA rated at 1000 hp1150 kw
Max. speed
55 kph
Weight
58 tonnes
Axle load
14.5 tonnes
Minium Radius
70 metres


Gallery
Click on thumbnails to view fullsize images


D10Hthumb001D10Hthumb002D10Hthumb003

D10Hthumb004D10Hthumb005D10Hthumb006

D10Hthumb010D10Hthumb008D10Hthumb009

D10Hthumb010D10Hthumb011D10Hthumb012

D10H013D10Hthumb014D10Hthumb015

D10Hthumb016D10Hthumb017D10Hthumb018

D10Hthumb019D10Hthumb020D10Hthumb021

D10Hthumb022D10H023D10Hthumb024

A Special Ceremony

D10Hthumb025D10Hthumb026


In Chinese Service

DF21thumb001DFH21thumb003

DFH21thumb004DFH21thumb005DFH21thumb006
Locomotive Classifications

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.

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Railways in Vietnam website 2009-2013 David Gurnett
  Updated November 13, 2013
All images remain the copyright of their original owners and are reproduced purely for the purposes of research.

Please feel free to contact me at railwaysofvietnam@gmail.com