Sooooo you'll have 4 luggage total? 2 each? Often those trains have long stairways to and from the cars, very steep steps, often each step is so narrow, it holds only half a foot sideways or the toes of one shoe.
In cases such as yours, the guys stay on the ground and place their wives at the top of the stairs, then the guys take each luggage in turn, place it flat on the stairway and push it up to the wife who has to bend all the way down to haul up the luggage and get it inside the car. In your case, you will do this 4 times.
You can imagine this is No small feat for the wife, it wears her out. I've seen women get caught in the handle while the case pulls her off her base and drags her back down the long steep stairway!
Now you admit you know what you should do, so do it. Go with one carryon each and that's it. Revamp and repack your luggage now. It's your Honeymoon, make it sweet and easy. It's very sexy to Lightly pack one carryon each.
On the way back down, the stairway becomes the slide it truly is. One goes down to the ground, the other stays on top and places each luggage flat so it can slide down the stairway and get caught by the person on the ground.
Make your Honeymoon about You, Not about your luggage.