Co-Co diesel electrics originally from Alco
(1961-1964), later manufactured by DLW (1968-1993). The initial batch of
55 from Alco were used for evaluation and comparison with a similar
batch of General Motors locos. The Alcos were chosen as the preferred MG
main-line diesel locos. Alco model is DL535A. Originally manufactured
with only vacuum brakes and dynamic braking, no air brakes. Rated at
1350/1200hp. Max. speed 100km/h. YDM-4A are identical to YDM-4, except
that they were supplied by MLW (1964) -- the Canadian batch consisting
of about 99 locos. Some of the MLW locos do not have the 'A' suffix in
the class designation.
DLW has exported some (15 each) of these to Tanzania and Vietnam
(1976-1985), and to Bangladesh (2000?). The ones for Bangladesh were
classed
YDM-4BR and had dual cabs, a change achieved
without modifying the length of the loco. This variant turned out later
to have major cooling problems.
Malaysian railways (KTM) acquired 39 used YDM-4's from IR in 1996.
It is not clear if they were leased or sold. Of these, 14 were returned
to India by 1999. In Malaysia they retained their IR road numbers
(between 6352 and 6725).
- Builders: Alco, MLW, DLW
- Engine: Alco 251B-6 (Alco/MLW), Alco 251D-6 (DLW); 6 cyl., 4-stroke, inline
- Transmission: Electric (DC-DC, in contrast to most other locos that were AC-DC).
- Axle load: 12t. Bogies: Co-Co trimount.
- Fuel capacity: 3000l
Currently only few lines are active in which YDM4's can be seen
PS : Information taken from IRFCA
I will share the pictures taken only by me. This blog will be updated when ever i cover a meter gauge having YDM4's. All the images are my copyright. The images should not be used anywhere without my permission.
Gallery
1. GOC (
GOLDEN ROCK )
2. SBI
3. MHOW (
MHOW )
4. IZN
5. FL
6. NKE
