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American Association of Railroads (www.aar.org)
AREMA
Railroad Performance Measures
RailroadData.com
TSD
The Rail Forum
Petro-chemical Industry Links
Downtime Central
Robotics On-Line
PLCs.Net
Engineering Tips Forum
Control.com
Automation.com
Autofieldguide.com
EngineeringTalk.com
ControlGlobal.com
ISA.org
IEEE
Cenelec
FRA
ANSI
International Electrotechnical Commission (IEC)
ASME
