No MARC service on weekends.
Amtrak Capitol Limited:
Stops at 11:30am eastbound, 5:15pm westbound (if on time)
CSX freights:
Look for Rockrunners to Millville and the Brunswick/Winchester turn coming onto or off the Shenandoah Sub (this is the track on the bridge used by the Appalachian Trail).
Mainline freights will be likely a couple of autoracks, a manifest or two, and perhaps a coal drag or grain train. You'll know when Amtrak's near as the freights will vanish for a while.
Shenandoah Jct. , a few miles to the west, offers additional traffic where NS crosses CSX, there are usually some knowledgable fans hanging out there.