I see that a GG1 from O-Line Reproductions is on Evilbay. I've never heard of O-Line, but I was out of touch with O gauge trains for quite a few years. The box look s suspiciously like a K-Line box as do the GG1s the seller has listed.
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O Line is basically Ready Made Toys products. My understanding, which may not be 100% accurate, is RMT went out of business and didn't pay the bill on the remaining stock in China. The factory is then selling the remaining product under the O Line name.
I think the GG1 is K-line tooling but am not certain. I bought a pair of streamlined 027 passenger cars that, while sold under OLR/RMT have "K-line Electric Trains" cast into the cars. The 027 cars are quite nice. I have mine apart now to add people to them.
Personally, I'd be a little leery about buying a motorized unit as the availability of servicing and/or parts may be slim to none. If you want a conventional, semi-scale GG1, I'd look at the Williams and/or MTH Railking "Postwar sized" clone.
The RMT GG-1 models sure looked like the K-Line products. I know some of the other RMT products were from K-Line, the trucks on several models still had K-Line molded into the castings! 
SJC posted:"... Personally, I'd be a little leery about buying a motorized unit as the availability of servicing and/or parts may be slim to none. If you want a conventional, semi-scale GG1, I'd look at the Williams and/or MTH Railking "Postwar sized" clone. "
A question for forumites who are techs, is availability of parts for O-Line/RMT much of a problem compared to obtaining parts for other brands?
Lots of people buy K-Line stuff, they're gone as well. Since much of the RMT stuff is K-Line based, I suspect parts are around.
Very few parts for Williams by Bachmann are available on their site.....but few worry about buying WbB??? Why so much worry over K-Line/RMT/O-rep???
