Originally Posted by
teflon
See
here for Dublin to London, and then
here for London to Berlin. It doesn't look like the connections work out well to let you do it in a oner, so you'd probably need an overnight in London or Paris (or even both)
teflon, you posted the Ireland to London link twice - so I don't know what seat61 is suggesting for the journey from London to Berlin.
Looking at the London arrival times... there is a way of doing this without an overnight stop, and that's going back to the good old Harwich to Hoek van Holland ferry. Not as seamless as it once was, but you can still do London to Any Dutch Station for GBP 39.00 plus the cost of a cabin (unless the posters at my local station are out of date). The boat train leaves London at 19.32
Arriving at Hoek van Holland it's a commuter train to Rotterdam, then another train to Hengelo, then a direct train to Berlin from there.