I purchased a ticket online from DB. Does anyone know if I can upgrade the ticket at the railway station (Munich) to first class?
Thank you
Have no idea BUT there is a first class ticket window at the train station. Go ask. Also a first class lounge is available in the station.,
Depends on your current ticket fare.
Full answer of Bahn is here in German.
"Can I upgrade my ticket from 2nd class to 1st class?
If you have booked a ticket at the Flexpreis fare, then you can upgrade to 1st class at the DB Reisezentrum for a surcharge.
Saver fares are excluded from the upgrade.
Alternatively, you can cancel the 2nd class ticket and book a new 1st class ticket.
Please note that a BahnCard for 2nd class does not entitle you to a discount for 1st class."
Translated with DeepL.