What is GEFX?

and again
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Train details MNPHK 27 Engines UP 005268 | UP 004903 | UP 009082 | GCFX003071
Scheduled Scheduled arrival | GRERIVER, WY | WX817 | 10/28/06 02:38M | 082 loads | 036 empty | 11840 tons | 07380 feet
Last Passing train | LARAMIE, WY | WX566 | 10/27/06 13:04M | 082 loads | 036 empty | 11840 tons | 07380 feet
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GCFX 3071????

Another odd ball unit.
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Train details ZCIG1 26 Engines UP 008324 | UP 004016 | GSCX007366 | UP 008395
Scheduled Scheduled arrival | GRERIVER, WY | WX817 | 10/28/06 11:04M | 087 loads | 000 empty | 05439 tons | 06633 feet
Last Train arrival | LASVEGAS, NV | CX479 | 10/27/06 11:12P | 087 loads | 000 empty | 05439 tons | 06633 feet

UPRR< I did some research, and found out that the owner is General American Marks Company, according to RRpictures Archives...

Link: http://www.rrpicturearchives.net/locoPi ... x?id=14237

So, maybe thats what the marking is for.