I just purchased a new Bachmann Berkshire 2-8-4 HO Pere Marquette #1225 Sound Value.  Right out of the box it was jerky at low speeds, mi-range speeds, and some at all speeds.  The engine is jerky regardless if it is pulling cars or not.  Even the cars jerk enough up grade to the point that the couplers load and unload on multiple cars.

Are there settings or adjustments that can be made, or should I send it back to Bachmann for repair or replacement.

Thanks,
Richard

I just bought my first Bachmann train, an HO Southern 2-8-0 Green #722 and so far really like it. Included in the box with the engine were two small clips in a clear plastic bag, but no hint as to what they are.  They are all metal with three legs or pins.  What are they used for and why do I need them?