This is just my interpretation of whole scene.
I think the vagueness of Kozue's words -- "you mean that?" makes it a bit confusing. I guess in the context we're supposed to imply it to mean "oh? the train~?" "is Kozue going somewhere (away)?" like producer asked what she was up to or something off page.
Then producer proclaiming or reassuring that he'll follow Kozue no matter where she goes (career or otherwise) as a supporter. All tying into the idea that she isn't alone anymore. gist of pgs 26-28
Still confusing regardless.