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NAMING SCHEME OF INDIAN RAILWAYS LOCOMOTIVE  
2 Answers
Oct 08 2019 (10:13)
Locomotives

Entry# 2211     
guest
NAMING SCHEME OF INDIAN RAILWAYS LOCOMOTIVE

29801 views
3
Aug 28 2020 (14:09)
Blog Post# 4697693-1     
Guest: 6cda585c   Added by: DineshKumar^~  Aug 29 2020 (14:09)
Locos, except for older steam ones, have classification codes that identify them. This code is of the form '[gauge][power][load][series][subtype][suffix]'

In this the first item, '[gauge]', is a single letter identifying the gauge the loco runs on:

W
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more...
= Broad Gauge
Y = Meter Gauge
Z = Narrow Gauge (2' 6")
N = Narrow Gauge (2')
The second item, '[power]', is one or two letters identifying the power source:

D = Diesel
C = DC traction
A = AC traction
CA = Dual-power AC/DC traction
B = Battery electric(rare)
The third item, '[load]', is a single letter identifying the kind of load the loco is normally used for:

M = Mixed Traffic
P = Passenger
G = Goods
S = Shunting
L = Light Duty (Light Passenger?) (no longer in use)
U = Multiple Unit (EMU / DEMU)
R = Railcar (see below)
The fourth item, '[series]', is a digit identifying the model of the loco. Until recently, this series number was simply assigned chronologically as new models of locos were introduced.

Revised class notation for diesels, 2002: However, starting in 2002, for diesel passenger, goods, and mixed locos, i.e., WDP, WDG, and WDM sequences, (and only for them, apparently, not for electrics, nor for diesel shunters), the series digit identifies the horsepower range of the loco, with '3' for locos with over 3000hp but less than 4000hp, '5' for locos over 5000hp but less than 6000hp, etc. This new scheme will be applied to all passenger/goods/mixed-haul diesel locos starting in June 2002, except for the WDM-2 and WDP-1 classes of locos.

The fifth item, '[subtype]', is an optional letter or number (or two of them) that indicates some smaller variation in the basic model or series, perhaps different motors, or a different manufacturer. With the new scheme for classifying diesel locos (see above), the fifth item is a letter that further refines the horsepower indication in 100hp increments: 'A' for 100hp, 'B' for 200hp, 'C' for 300hp, etc. So in this scheme, a WDM-3A refers to a 3100hp loco, while a WDM-3F would be a 3600hp loco.

The last item, '[suffix]', is an optional indication that indicates something special about the loco, such as a different gearing ratio or brake system than usual.

Source: irfca.org

★  
60679 views
8
Oct 08 2019 (09:54)
Blog Post# 4451710-12     
TheMadrasMail~   Added by: guest  Oct 08 2019 (10:16)
1) Naming diesel locomotives based on their power output, started only in 2002. Prior to that, the last digit in the locomotive class name represented the chronological order of the introduction of the locomotive. In 2002, the naming scheme was changed to represent the output power. But the WDP1 loco and all the shunters were exempt from the naming scheme. Since the WDM6 and the WDM7 are mainly used as shunters, they were not renamed.

For example, WDM1 was a BG, mixed-use diesel loco, and the first mainline diesel loco introcduced, hence
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more...
the suffix '1' at the end. Similarly, WDM2 was the second, WDM3 (NOT the present day WDM3A, WDM3 were a different class of locos homed only at Gooty in SCR) the third, WDM4 the fourth and so on.

In that sequence, WDM6 was the 6th mixed-use mainline diesel locomotive. It was designed in the early 1980's, long before the naming scheme was changed. So it was named thus.

2) It is rated at 1350HP. They were constructed by using the YDM4 (the main metre gauge diesel loco) powerpack on BG bogies.

3) They were intended to haul short commuter trains in suburban areas along with light shunting. Hence the WDM class. However, MEMU's and DEMU's quickly came around and did the job better than these locos. So these just handle shunting jobs now.

There are quite a few 6000+ HP diesel locos in the world. Both EMD and GE produced 6000+ HP locomotives for a long time and they were operated in the US. China too has operated high powered diesel locos.
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