Spotting
 Timeline
 Travel Tip
 Trip
 Race
 Social
 Greeting
 Poll
 Img
 PNR
 Pic
 Blog
 News
 Conf TL
 RF Club
 Convention
 Monitor
 Topic
 Followed
 Rating
 Correct
 Wrong
 Stamp
 HJ
 Vote
 Pred
 @
 FM Alert
 FM Approval
 Pvt
Search Trains
 ↓ 
×
DOJ:
Dep:
SunMonTueWedThuFriSat
Class:
2SSLCCEx3AFC2A1A3EEA
Type:
 

Train Details
Words:
LHB/ICF:
Pantry:
In-Coach Catering/Pantry Car
Loco:
Reversal:
Rake Reversal at Any Stn
Rake:
RSA:
With RSA
Inaug:
 to 
# Halts: to 
Trvl Time: to  (in hrs)
Distance: to  (in kms)
Speed: to  (in km/h)

Departure Details
Include nearby Stations:      ONLY this Station:
Dep Between:    
Dep PF#:
Reversal:
Rake Reversal at Dep Stn

Arrival Details
Include nearby Stations:      ONLY this Station:
Arr Days:
SunMonTueWedThuFriSat
Arr Between:    
Arr PF#:
Reversal:
Rake Reversal at Arr Stn

Search
4-month Availability Calendar
  Go  

तो क्या हुआ , जो एक ट्रेन निकल गयी तुम्हारी, जिंदगी के ट्रैक मे अगली ट्रेन भी आएगी। - karthik

Full Site Search
  Full Site Search  
 
Wed Oct 28 06:19:49 IST
Home
Trains
ΣChains
Atlas
PNR
Forum
Topics
Gallery
News
FAQ
Trips/Spottings
Login
Advanced Search
NAMING SCHEME OF INDIAN RAILWAYS LOCOMOTIVE  
2 Answers
Oct 08 2019 (10:13)
Locomotives

Entry# 2211     
Soumik_BWN^~
NAMING SCHEME OF INDIAN RAILWAYS LOCOMOTIVE

Aug 28 (14:09)
Blog Post# 4697693-1     
railfan^~   Added by: DineshKumar^~  Aug 29 (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
...
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

★  
Oct 08 2019 (09:54)
Blog Post# 4451710-12     
TheMadrasMail^~   Added by: Soumik_BWN^~  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
...
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.
Scroll to Top
Scroll to Bottom
Go to Mobile site
Important Note: This website NEVER solicits for Money or Donations. Please beware of anyone requesting/demanding money on behalf of IRI. Thanks.
Disclaimer: This website has NO affiliation with the Government-run site of Indian Railways. This site does NOT claim 100% accuracy of fast-changing Rail Information. YOU are responsible for independently confirming the validity of information through other sources.
India Rail Info Privacy Policy