Anyone know if there are lockers or a left luggage counter either in the airport or at the attached Fernbahnhoff?
I've stored business attire at left luggage in Frankfurt for a week while I vacationed.
According to the Facts and map at http://www.bahnhof.de/site/bahnhoefe/de/sued/frankfurt__flughf__fernbf/frankfurt__flughf__fernbf.html, there are neither lockers nor left luggage at the train station. As mentioned above, there is left luggage in both terminals (more info at http://www.frankfurt-airport.com/content/frankfurt_airport/en/checkin_luggage/luggage.html#fratab_d339764).
Left luggage storage in Terminal 1, is next to Arrival Gate B-1. The Meeting Point for Terminal 1 is also there. Cost is 4 euro per bag up to 7 hours and after that it costs 1 euro more that is good for 24 hours. You pay when you pick up your bag and you can also use a credit card here. The Regional Train station is right below this, just more in front of B-1.