Discount of train ticket

Germany pass 優惠有 subway (S-Bahn ) and special discount for Berlin-Warsaw Express only. No discount for trains in Poland and Paris. 用優惠一定要validate及計算一日pass.
From raileurope.com "Please note that use of a Free travel bonus will require the use of a day on your railpass. In order to take advantage of a travel bonus, your pass must be valid for the country each desired bonus is offered for." http://www.raileurope.com/us/rail/passes/bonuses/eurail_bonuses.htm
Other discounts:

Free transportation on boats of the Koln-Dusseldorf Rheinschiffahrt AG Line (KD Rhine Line) on:

The River Rhine between Cologne and Mainz
The Mosel River between Koblenz and Cochem am Mosel.
A supplement is needed for the hydrofoil. (Ships with cabins are not included).
On the Lake of Constance a 50% reduction on all boats operated by Bodenseeschifffahrtsbetriebe
A 60% discount on the following Europabus routes:

"Romantic Road" route,(Frankfurt am Main–Wurzburg–Augsburg–Munich–Fussen
"Castle Road" route (Mannheim–Heidelberg–Rothenburg o.d.T.)

如果你持有的是 GERMAN PASS, 就只適用於德國國內的火車, 法國及波蘭的火車都用不上, 國際線的火車 (例如德國出發去巴黎) 就只可以 COVER 到德法邊境, 法國的車程需要另外購票的.
如果你需要 COVER 整程巴黎到德國的行程, 就需要購買法德火車證. 波蘭也是同一 CASE.
因此假若你只有 GERMAN PASS, 德國以外的火車就需另行購票了