Amsterdam to Berlin CNL sleeper with German Rail Pass??

In general, yes. You can book 90 days or so in advance. To find the supplements, go to the Deutsche Bahn website and pick your day of travel, and time 19:00 and you will see the CNL train leaving 19:01, arriving Berlin 4:23. Click on "check availability", enter the travelers' ages, and the next page will show the prices for day coach, couchettes, and sleeping compartments. At the bottom of the page, click on "Book only extra charge". On the next page you enter type of pass (Interrail, Eurorail, or other). The next page will show the extra charges. In the case of the March 13 CNL, the extra charge for 2 in the day coach is 23 euro, 6-berth couchette is 55 euro, 4-berth couchette is 75 euro, and 150 euro in an economy sleeping compartment.

On this train, you could buy two advance economy sleeping compartment tickets for 208 euro, so your pass is only saving you 58 euro, 29 euro per person. So consider carefully if the twin pass actually saves money.

Additionally, I am not 100 % sure there is not an additional supplement to cover the Netherlands portion of travel. You should check with Deutsche Bahn to confirm.

This is only a 6 hour train ride. Not sure why you would want a sleeper cars at all.

A German rail pass is not valid in a country that is not Germany (with one or two exceptions at border cities like Salzburg). It gets you no discount on NS, the Dutch railways.

I agree with Nigel. The night train ticket consists of two parts. The rail part which is just the price to transport you from Amsterdam to Berlin, i.e., to let you be on the train. The other part is a supplement, or Aufpreis, for your accommodations (seat, couchette, sleeper).

When you pay the supplement, the accommodations are yours for the entire length of the trains journey (or for whatever part of that trip you have paid to be on the train). They don't sell the compartment for just a part of the trip and then resell it to another passenger for the rest.

But you must have a ticket (or tickets) for the entire length of the journey - on the same route - that you will be on the train. Thus, for example, people who want to go by night train from Munich to Italy, and have a Select pass that only covers Germany and Austria, must also buy a ticket that covers the last "German" station (Kufstein) to the first stop in Italy (Fortezza. I don't think Brennero would work since that train doesn't actually stop there).

So you will need a ticket that is valid on that class of train (IC/EC, not just regional) from Amsterdam to Emmerich, Germany. It looks like an IC/EC ticket for just that section will be hard to find, so, unless the rail pass is otherwise cost effective, you might as well just use an advance purchase SparNight ticket for the whole trip.

This is wonderful information! Thank you all so much. I am looking at my transportation options, day train, night train and flights between AMS and BER.