We supply products and service solutions for the rail, mass transit, oil, gas, mining, and wind power generation industries.

Sherwood Electromotion Inc. (SEI), a qualified and approved vendor to the Transit Authorities and Rolling Stock Manufacturers, provides a complete range of reliable products, distinct services, and application-specific solutions for equipment integrated within different propulsion systems.

Mass Transit vehicles and their propulsion systems are as diverse as the riders who use them. Although different types and makes of propulsion systems perform the same functions, equipment in each particular system requires distinct maintenance and overhaul services. Consequently, there is a growing demand for experienced suppliers who can successfully meet industry’s requirements for specific service solutions.

Over the last four decades SEI's investment in innovation, engineering and quality assurance has resulted in the development and implementation of dedicated manufacturing, re-manufacturing and overhaul processes. SEI uses these effective processes to service propulsion system equipment originally supplied by the industry leaders: ABB, BAE, TSA, VEM, GE, EMD, Alstom, Bombardier, Siemens, Westinghouse, Mitsubishi, Hitachi, Toshiba, Skoda and others.

SEI's products and services cover all three Mass Transit modes: locomotive systems, powered vehicle systems and bus systems. A complete line of SEI's products and services is represented by the following major groups and categories:


Main Generators
Main Alternators
DC Traction Motors
AC Traction Motors
Combo Units
Auxiliary Power Generators
Cooling Fan Assemblies
Blower Assemblies
Motor-Alternator Sets
Linear Motor
Hybrid System Traction Motors
Hybrid System Traction Generators
Auxiliary Equipment


Form & Random Wound Coils
Fans and Impellers
Brush Holders
Cable Assemblies
Couplings and Pinions
Wheel Sets
Replacement Parts


Tests and Diagnostics
Fault and Root Cause Analysis
Performance Analysis and Improvement
Condition Based Repairs
Catastrophic Damage Repairs
Structured Overhauls
Bearing Replacement Programs
Rewind and Recoil Programs
Insulation Systems Improvements
Components Modifications
Upgrades and Conversions
Unit Exchange (UTEX) Options
Contract Manufacturing

The reliability of the offered products, the quality of the supplied services and the timely delivery of all products and services are assured by the utilization of a dedicated Quality Management System (QMS). This comprehensive QMS is supported by the ISO 9001:2015 and AAR M-1003 corporate certifications.

SEI's Mass Transit Transit Industry Scope of Supply

SEI's Scope of Supply offers a world-wide customer base the Optimal Choice and Value for the Mass Transit industry, related Parts, and required Services.


SEI has dedicated engineering and manufacturing programs to ensure the availability of high quality parts and sub-assemblies.


SEI is proud to offer its customers a wide choice of standard and application specific services.

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