Thank you Richard, so it is a wad (works as designed, except if the program crashes)! Good to have an understanding of what kind of mechanism is behind the scene here. Earlier in the same folder where alg-files stored, there is a loc-file with the same name as algs. I suppose the "loc-file" option is no longer used in PowerCivil or PowerRailTrack programmes, can you confirm it? Regards, LiPeng
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