kd line

If you are asking if you can do it, physically, of course you can, as long as you pay attention to the schedule and don't run out of day.

If you are asking about the fare, that's another question. When you took the boat from St. Goar to Bacharach and back, you probably bought a round trip ticket from St. Goar to Bacharach. In this case, you can't buy a ticket from St. Goarshausen to Bacharach and go by way of Boppard. You could buy a round trip ticket from St. Goarshausen to Boppard and then a ticket from St. Goarshausen to Bacharach.

But why would you want to do St. Goarshausen to Boppard and then come back on the boat to St. Goarshausen. The boat one way is excruciatingly slow. You have plenty of time to see everything on the shore. No need to see it twice. Instead, take the ferry across from St. Goarshausen to St. Goar, then take the train to Boppard and come back to Bacharach on the boat.

Here (page 9) is the schedule of the K-D boats on the Rhein.

"If you were to catch the kd at st goarshausen, can you then go to boppard, then back down to bacharach? Last time I took the ferry from bacharach to st goar and back down..."

I'm not clear on where you are sleeping on the night after your cruise. Bacharach? St. Goarshausen? Aachen?. I assume you're starting in St. Goarshausen because you've chosen to stay at Pohl's there, either before or after your cruise (or both.) But if you are ending your day in Bacharach (as your plan indicates) that means you're taking your bags along, and you'll need to schlepp them to/from the boats and possibly around Boppard unless you have other arrangements.

Anyway, if you end your cruise as planned on the Bacharach side of the river, it seems like you may need to get back to St. G'hausen after that, either because you're staying there that night, or because you left your bags at the front desk there for pick up later in the day prior to your trip to Aachen... so you probably need to catch the train to St. Goar (10 minutes) and then use the ferry to cross the river.

On a previous thread I (and another regular named Jo) suggested to you that the most scenic cruise is Bingen (or Ruedesheim) - St. Goar (Bacharach is right in the middle of this stretch of river.) So I will suggest once again that you begin your cruise in Bingen (or R'heim) - that way you can see the same segment you saw on your last trip (Bacharach - St. Goar) AND the other half of the most scenic part (Bingen/R'heim - Bacharach.)

Since you also want to visit Boppard and don't mind spending extra time on the boat, I suggest that you continue your cruise north right past St. Goar to Boppard; all you need for this day would be a one-way cruise ticket from Bingen/R'heim to Boppard.

So if you do your cruise as I just outlined, you spend about 2.3-2.5 hours on the cruise boats and will see...
- Bacharach and Boppard
- the Rhine segment you saw before
- a new segment south of Bacharach
- a new segment north of St. Goar

You can break up your cruise with a stopover in Bacharach - one hour, two hours, three hours depending on when your cruise begins. Just get your stopover okayed by train personnel (they mark your ticket.) The price of a cruise ticket from Bingen/R'eim to Boppard is E26.40 (but you get a 20% discount if you take the train to Ruedesheim (or Bingen) to board the cruise - just show your train ticket at the KD dock.)

If you do the cruise you describe in your post, you'll spend 3.25 hours on the boats and spend E29.40 normal price for the two tickets Lee has suggested. But you will once again miss out on half of the most scenic part of the river.

From St. Goarshausen you would take a direct train to Ruedesheim (25 min., E6.20) to begin your cruise. After your cruise, to return to St. G'hausen, you would take a train south to St. Goar (E3.70, about 10 min.) and use the ferry crossing as I suggested previously.