In message , Paul Scott
writes

I was meaning the gap between the last main line services stopping in
the1960s?, and the line being transferred to LU, which I believe was during
the 90s.

The last stopping service was in May 1941, although it is certainly true
that until the 1960s the line was used much more than it is today by
non-stopping services (and, I believe, by freight).

--
Paul Terry