About Us
M/s. Involute Engineers & Industries (M/s. IEI) has been engaged in manufacture and indigenous development of Electro-mechanical & Electro-pneumatic equipment for Railway transportation, since its inception in 1984. Major thrust of its activity has been the import substitution in above mentioned field.

M/s. Involute has rendered a considerable and meaningful contribution by indigenously developing among others a variety of critical spares & sub-assemblies for N-32 Tap Changer. N-32 Tap Changer is a vital equipment in A/c Electric Locomotive. IEI has been a major supplier of railway components to M/s. Adtranz, Baroda (formerly M/s. Asea Brown Boveri Ltd.) and OEM for N-32 Tap Changer. Presently, M/s. IEI caters to the maintenance demand for Tap Changer & Circuit Breaker spares to all the Electric Loco Sheds in India under various Zonal Railways.

In 1995, M/s. BHEL had entrusted M/s. IEI to develop and supply complete SMSC i.e. railway components like D.C. Controller for fitting in WCAM2, WCAM3 & WCAG1 Electric Locomotives (AC/DC) within a limited time frame. These equipments were earlier being imported from Switzerland. IEI met the challenge successfully. Presently, 170 pieces of such equipments and railway components are functioning satisfactorily in Mumbai area under Western & Central Railways.

Our Promoter
Involute Engineers & Industries has been promoted by Sri Mrityunjoy Hazra, a Post Graduate Mechanical Engineer, with training abroad under Confederation of British Industries Overseas Scholership (UK).

Quality
IEI's quality assurance department is equipped with sophisticated and modern measuring instruments, including a standard Room. IEI maintains a well equipped precision workshop with imported Spur & Bevel Gear generating machines including Gear Testers.

IEI is an ISO-9002 (NO FM 56323) certified concern. We have been approved by Research Designs & Standards Organization, Lucknow - Ministry of Railways as regular source for manufacture & supply of the NO32 Tap Changer Spares (Adtranz type).

Our Customers

Eastern Railway, Fairlie Place, Kolkata - 700001

South Eastern Railway, Garden Reach, Kolkata - 700043

Central Railway, C.S.T. Mumbai - 400001

Western Railway, Church Gate, Mumbai - 400020

Southern Railway, Park Town, Chennai - 600003

South Central Railway, Rail Nilayam, Secunderabad-500071

Northern Railway, Baroda House, New Delhi - 110001

Metro Railway, Metro Rail Bhawan, 33/1 Chowringhee Road, Kolkata - 700071

Bharat Heavy Electricals Ltd., P.O.- BHEL, Jhansi - 284129

Bharat Heavy Electricals Ltd., Piplani, Bhopal- 462022

Bombardier Transportation India Ltd., Maneja, Vadodara - 390013

Disel Locomotive Works, Varanasi