After breakfast and coffee at McDonald's I took a morning train from Trier to Luxembourg City for the day.
It rained off and on all day so that put a damper on my sightseeing but it was still nice to look around.
Neumünster Abbey in the old town was the most scenic area to explore. I went into the casemates tunnels to get out of the rain for awhile.
Everything in Luxembourg was about 50% more expensive than Germany except for the return train trip to Trier which was about 50% less.