Aldon Company, Inc.

Apex Rail Automation

ARMS, Inc.

Astronics Test Systems

Avante International Technology

Jaychris Indus-Rail Supply Inc.

PTMW Inc.

Retlif Testing Laboratories

S & C Distribution Company

SERRMI Products LLC

Tracsis

Twinco Mfg. Company, Inc.

Ultra-Tech Enterprises

Western-Cullen-Hayes, Inc.