AmFlyer,
I currently own just a loop of Lionel AF FasTrack, an upgraded [to DCC] American Models hi-rail streamlined Pacific loco and tender, an assortment of American Models Budd passenger cars, and a basic Digitrax Zephyr DCC system. On occasion I've encountered a problem simply attempting to couple together a slowly moving backing train [motive power alone or with a consist of cars] into a stationary car. The stationary car will move away from rather than couple onto the train. What, if anything, can be done- -besides, obviously, substantially increasing the speed of the rearward-moving train and/or adding weight to each car- -to prevent this from happening?