Its ok I've found them they are the trucks on the MARC GP40's on Trainz Commuter Rail. Then again I've more missing kuids and they are also aren't on the download station. They are kuids 52779:53000 and 52779:55020.
Don't worry about kuid 52779:53000 , it doesn't matter if that one is there or not apparently.
As for kuid:52779:55020 it is asset name AC4400cw Canadian Pacific on the homepage of Protrainz.
I downloaded AC4400CW Canadian Pacific from http://www.protrainz.com/download.htm
It included kuid:52779:55020 with minor texture error. Deleted leftside vents.texture.txt file saved/commited ok. Deleted kuid 52779:53000 from the locos config.txt file in the kuid-table. Commited ok. Locos work ok.