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i have a similar problem with three of my engines. they are atlas dash 8's. on the downgrade they surge off and on. i contacted digitrax and they told me it was a mechanical problem. the worm gear at the top of the gear tower binds when the engines have pressure put on them such as going downgrade. going upgrade or on level track this is not a problem. i use a nce power system but these engines have digitrax decoders in them, installed in them at the factory. i also contaced nce and they said the same thing about the worm gears,further they said that athearn engines were notorious for this behavior,but i have three gp60m's i just bought and they run fine. i would like to hear more from others about this problem. further all my other engines kato,steward and some older atlas operate without problems
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