Roller Coaster Companies?

Do these companies only create roller coasters or do most of the create other things?

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Best Coaster: Millennium Force
Worst Coaster: Project Stealth

From all I've read, most have started, if not continued, in other things, and then found their way into the coaster biz.

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ATTENTION!!...This is the Alter Ego of Goliath Rocks; If he said something stupid, we're sorry, it's the "G"s talking...

Yeah, when I went to the Intamin website they had transport machines (trains). But I don't know about the others

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Best Coaster: Millennium Force
Worst Coaster: Project Stealth

Arrow built the Horseless Carriages (car ride) at Old Tucson.