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D4H/D4Hr
Bo-Bo Diesel Hydraulic

d4h1

These small Russian built diesel hydraulics formed the main non steam roster for a number of years, though they are getting old and worn. At 400 hp they are hardly the most powerful locomotives ever built but seem to have served their purpose extremely well.
They are referred to as type TU7E (the E designating export) by the Russians and are very similar to locomotives supplied to Cuba for it's metre gauge system.
There seems to be some confusion as to how many are still in service. One source says none are now in service! (definitley not true!)
According to one source, the locomotives were introduced from 1975 onwards. Another source says they were built from 1972 to 1994 but not introduced to VN until 1984 (This seems to be reasonably accurate - see further sources below). 183 locomotives were still in service in 2001.
The original TU7's were built for Russia's narrow gauge lines including forest products lines. They were introduced in 1971/2 and were built by the Kambarka Engineering Works. This was the seventh model in a line of narrow gauge locomotives stretching back to the 1950's.  There were two models, the TU7 and TU7A. It would apear that the DSVN vesion is the heavier TU7. The TU7 was designed to be used on any gauge from 750 mm to 1435 mm.
The company had already supplied up to 30 TU5 locomotives to Vietnam (presumably the north).(see TU5 page).

A Russian language source states:
There were 247 TU7s delivered to Vietnam in 1985. They were classified as TU7E and TU7AE.
In Vietnam they were classified D4H (Diesel, 400hp, hydraulic transmission)
They were numbered in the D4H-400 and D4H-500 (192 TU7E), and D4H-800 (62 TU7AE) ranges.
Due to poor mechanical condition 50 had been withdrawn by 1998.

From Another Russian Language Source:
In 1986 The TU7 (TU7E) was modified with "slightly modified circuitry, increased static deflection spring suspension, friction dampers used in place of hydraulic vibration" and was clasified as TU7A (TU7AE). This suggests that the last batch of 62 (TU7AE) D4H-8XX, were delivered during or after 1986. The same source also says: "Another batch of TU7 on 1000mm track was built in 1991 for the railways of Vietnam". Could this be the TU7AEs?



d4h02d4h03

DATA:

Class: D4H/D4HR/TU7E
Country of Manufacture: USSR (Russia)
No. Originally delivered:
247 (?): Known Builders numbers: 2420-2425, 2428-2457, 2573, 2574, 3257-3265 (this only totals 47?)
Manufactured by: Kambarka Engineering Works
Model number: TU7E, TU7AE
Wheel Arrangement: B-B
Number currently in service (2010): Not known
Gauge: Most 1000mm but 9 regauged for standard gauge in mid 90's (D4Hr)
Length: 9600 mm over couplers
Width: 2550 mm (at widest point)
Height: 3550 mm (from top of rail)
Distance between bogies: 4700 mm
Diameter of wheels: 600 mm
Base of bogies: 1400 mm
Minimum radius: 40 metres
Maximum speed: 50 km/h
Total weight: 24 tons/24000 kg
Engine: V 12 400hp type ID12-400
Continuous tractive effort: 55 kn
Axle load: 5 tons


Verified Road Numbers From Images
D4H
433
Yen Vien
D4HR
864
1435 mm gauge Yellow Ha Lao
D4H
495
Green and yellow
D4H
457
Green and yellow
D4H
488
Red and yellow Ha Noi
D4H
570
Faded green and yellow Ha Noi
D4H
528
At Da Lat August 2010. Faded green and yellow. Not sure if operational.
D4H
459
Yen Vien Green and yellow
D4H
555
Yen Vien Green and yellow
D4H
441
Vinh Green and yellow
D4H(r?)
489
Yellow Yen Vien
D4H
454
Green and yellow Yen Vien
D4H
472
Yen Vien Green and Yellow
D4H
490
Green and yellow - scrap road?
D4HR
498
Yellow 1435 mm gauge Ha Lao
D4H
587
Green and yellow Ha Lao
D4H
496
Green and yellow Yen Vien
D4H
575
Green and Yellow Yen Vien
D4H
433
Green and yellow - in pieces in an unidentified  workshop and in operation
D4H
589
Green and yellow - coupled to D5H Yen Vien
D4H
812
Green and yellow Yen Vien
D4H
578
Green and yellow - coupled to D5H
D4H
594
Green and yellow Yen Vien
D4H
806
Green and yellow Yen Vien
D4H
811
Green and yellow Yen Vien
?
5??
V10B yellow - private owner steelworks?
TU7E 2452 Standard Green and yellow with Sai Gon on cab side (this is the original Russian No? Why? (TU7E). Note: This locomotive was noted working as the yard shunter at Thap Cham in August 2010. Still has Russian type and is still numbered 2452.




Verified Road Numbers from Whiteboard Image

D4H
428

D4H
433

D4H
454

D4H
459

D4H
462

D4H
472

D4H
478

D4H
487

D4H
490

D4H
555

D4H
863

D4H
866

D4H
496

D4HR
468

D4HR
473

D4HR
489

D4HR
498

D4HR
507

D4HR
534

D4HR
564

D4H
491
To be scrapped?
D4H
492
To be scrapped?
D4H
416
To be scrapped?

IMAGE GALLERY
Click on thumbnails for original images

D4H001tD4H002tD4H003t

D4h004tD4H005tD4H006t
D4H007tD4H008tD4H009t

D4H010tD4H011tD4H012t
D4H013tD4H014tD4H015t

D4H016tD4H017tD4H018t

D4H019tD4H019tD4H020t

D4H021tD4H022tD4H021t

D4H022tD4H023tD4H023t

D4H025tD4H026tD4H027t

D4H031tD4H032tD4H033t

D4H034tD4H035tD4H036t

DrH037tD4H038tD4H039t

D4H040tD4H041tD4H042t

D4H043tD4H044tD4H045t

D4H046tD4H047tD4H048t

D4H049tD4H050tD4H051t

D4H052tD4H052tD4H053t

D4H054tD4H055tD4H056t



D4H058tD4H059tD4H60t


D4H at Da Lat
August 2010

The following images of D4H-528 were taken by myself at Dalat Station Tuesday 27 July, 2010

D4HDalat01D4HDalat02D4HDalat03

D4HDalat04D4HDalat05D4HDalat06

D4HDalat07D4HDalat08D4HDalat09

D4H (TU7E) 2452 at Thap Cham August 2010

I captured the following images at Thap Cham Tuesday August 5, 2010

D4HThapCham01D4HThapCham02D4HThapCham03

D4HThapCham04
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 2009-2010 David Gurnett
  Updated September 26, 2010
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