Velmo, Making another connection at the other end is not going to solve the problem at least not on a simple 4X8 oval.
It sounds like to me you have one or more of these problems:
1. Dirty Track
2. Dirty pick up wheels on your loco
3. Loose rail joiners
4. A loose connection in loco's wiring
5. A loose connection at the power pack
6. A loose connection at the rails (terminal track)
7. A bad connection on the AC line (wall plug) of the powerpack
8. A faulty power pack
Check these out in the order that they are listed and I think you may find the problem. Power packs that come with trainsets are not the best in the world but they are adequate to operate a simple oval of track.
Hope this helps