Looking for a linear rail systems?

I have worked in a manufacturing industry for a decade and saw how a factory is run. The factory maintains linear rail systems to move finished items from one section to another. This system requires regular maintainance. My son now works in an automaker. He told me about he car parts are moved from one section to another using rail system.
reidsupply.com supplies Linear Motion Guide Systems & Components. It has ball slide and roller positioning stages, extrusion bearing and other items.