已有德国通票，从布拉格回法兰克福，如何最便

本人有德国通票，要从布拉格回法兰克福，所以
如何有最便宜的交通方式到德国境内的火车站再坐ICE到法兰克福？查过德铁有 Praha hl.n. (Autobusová St.
Wilsonova) 到 Nürnberg Hbf, Bahnhofvorpl.
Hauptausgang的大巴，但是已经太深入德国了吧？有无更加靠近边境的德国城市可以坐坐ICE到法兰克福的？

查了 http://www.studentagency.eu/
貌似在东德的只有DRESDEN?
谢谢指点

德铁上面 说 有德国通票的可以补订位费就可以了么？ 具体如何操作呢？
There is a mandatory reservation on the IC Buses which guarantees a seat and thus a relaxing time during the journey.On one-way tickets, the reservation fee is included in the price. Our German Rail Pass and the German Rail Pass Extensioncan be used for travel on the IC Bus Prague with an on-top reservation.