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Types Of Wheel Arrangements and Axle Arrangements in Locomotives of Indian Railways  
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Apr 19 2015 (13:47)

Entry# 1863     
Types Of Wheel Arrangements and Axle Arrangements in Locomotives of Indian Railways

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Mar 25 2015 (18:06)
Blog Post# 1407251-0     
Guest: 7fc2d2b0   Added by:   Apr 19 2015 (13:47)
********************** Types Of Wheel Arrangements and Axle Arrangements in Locomotives of Indian Railways ***********
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Whenever you see the Technical Specification of any Locomotive, you find a term known as "UIC Classification". Take for example
The UIC Classification/Wheel Arrangement of WAP 4 is Co'-Co'
UIC Classification/Wheel Arrangement of WAP 5 is Bo'Bo'
The UIC Classification/Wheel Arrangement of WAP 7 is Co'-Co'
The UIC Classification/Wheel Arrangement of WAG 9 is Co'-Co'
The UIC Classification/Wheel Arrangement of WAG 7 is Co'-Co'
The UIC Classification/Wheel Arrangement of WDM 3A/3D is Co'-Co'
In case of WDP 4 it is AAR wheel arr instead of UIC Classification which is B1-1B for WDP 4 and C-C for WDP 4B and 4D.
Now what does the term UIC Classification mean?
Ans: The UIC classification of locomotive axle arrangements describes the wheel arrangement of locomotives, multiple units and trams. It is set out in the International Union of Railways (UIC) "Leaflet 650 – Standard designation of axle arrangement on locomotives and multiple-unit sets".It is used in much of the world.
In other words UIC Classification is the Wheel Arrangement of Locomotives. If it is Bo'Bo it means the loco has two axles comprising of Four wheels in each axle in the front and in the rear side.(Total 8 wheels in the Loco) If it is Co'-Co' it means the Loco has two axle comprising of Six wheels in each axle in front and rear side.(Total 12 Wheels in the Loco).
For more details regarding UIC Classification its types please refer: click here
The term UIC stands for International Union of Railways to know more about International Union of Railways please refer:
click here
UIC classification is used widely in the world for all class of Locomotives.Only the United States uses the simplified AAR wheel arrangement for modern locomotives.United States don't use UIC Classification for the "Wheel Arrangement" of their modern Locomotives. In our Country also only WDP and WDG Class Diesel Loco use AAR wheel arrangement(As narrated above)
What is AAR wheel arrangement?
Ans: The AAR wheel arrangement system is a method of classifying locomotive (or unit) wheel arrangements that was developed by the Association of American Railroads. It is essentially a simplification of the European UIC classification, and it is widely used in North America to describe diesel and electric locomotives. In India this wheel arrangement is used for WDP and WDG Class of Diesel Locomotives. It is not used for steam locomotives which use the Whyte notation instead.
For more details about AAR Wheel Arrangement please refer: click here
For Steam Locomotives they use Whyte notation for their Wheel Arrangements.
What is Whyte notation?
Ans: The Whyte notation for classifying steam locomotives by wheel arrangement was devised by Frederick Methvan Whyte and came into use in the early twentieth century, encouraged by an editorial in American Engineer and Railroad Journal (December 1900). The notation counts the number of leading wheels, then the number of driving wheels, and finally the number of trailing wheels, groups of numbers being separated by dashes.Other classification schemes, like UIC classification and the French, Turkish and Swiss systems for steam locomotives, count axles rather than wheels.In the notation a locomotive with two leading axles (four wheels) in front, then three driving axles (six wheels) and then one trailing axle (two wheels) is classified as 4-6-2.
For more details about Whyte Notation of Wheel Arrangement in Steam Locomotives please refer:
click here
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Attached Image:
BRAND NEW RPM WAP4 22959(The Wheel Arrangement of this Loco is Co Co Six wheel axle total 12 wheels in this Loco)
Image Link: click here
Bo Bo or two wheel axle of Locomotive(total four wheel in each axle of the Loco) and it's parts(In Indian Railway only WAP 5 Locomotive has such axle as it is a Lightweight(78 Ton) High speed Locomotive)
Image Link: click here
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