"asdf" wrote in message

"Between 1963 and 1965 a new shorter route was built for the line
between Barbican and Moorgate, south of and lower than the previous
alignment. While the old route was in the open, the deviation line was
placed in tunnels ready for the Barbican Centre to be built over it."

Presumably the Widened Lines were moved in the same way at the same
time?