certainly DB is a better experience than any USA train, no argument

i did travel friday afternoon, and was only able to get a table seat

being over six foot, i found it super tight- like the LIRR

and since every sq.cm. was filled with passengers or luggage it was brutally claustrophobic- and hot and steamy

the snack cart could not make it through the cars due to the crowds

but yes, sunday mornings should be lightly traveled

did you look for another airport to fly into in europe other than FRA with a better bari connection?

there are morning flites from BRU, FCU, MUC, MXP, any of which will be less of a hassle than going to CGN