I have just acquired a pair of these locomotives brand new (very - very good deal). I took them to my train club last night and was told by a couple of members that they have had non stop problems with them. ie; intermittant running, not running, etc. Is there or was there a problem with these ? I'd like to know before I break them in. I have noticed that one will light up and not move until I fiddle around with it. If any of you have experienced this or any other problems - how did you solve it ?