PTC steel coaster train

Could anyone tell me what steel coaster(s) are running the the PTC trains. I knew what it was, but it just slipped my mind.

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"If you make it too smooth, it'll be like sitting in your living room."
-Bill Cobb - Designer, Texas Cyclone

Here's pics of the Texas Tornado, Wonderland, Amarillo, Texas. Its by OD Hopkins. A very odd layout includes a loop that was modified to be smaller in a rather odd way.

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"Outside of a dog, a man's best friend is a book. Inside of a dog it's too dark to read." - Groucho Marx

*** This post was edited by Mamoosh 3/8/2003 5:50:52 PM ***

That is the one. Thanks.

It is rather odd, but makes sense, since the box girder constrction is probably pretty solid. Cool, it also has an underground tunnel.

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"If you make it too smooth, it'll be like sitting in your living room."
-Bill Cobb - Designer, Texas Cyclone