Peter Lawrence wrote:
Exploring the furthest reaches Barbican station I noticed a third
tunnel mouth at the western end of the platforms, between the TL and
KU tunnels, and what looked like a ground frame, still connected to
point rods disaooearing into the ballast, between the TL tracks. Were
these related to the former Smithfield goods station? ( I thought
Smithfield goods was south of the TL tracks, as showm at
http://www.londonrailways.net/snowhill.htm.)

The line between Barbican and Moorgate was moved before the Barbican Centre
was built. (I don't know if this is relevant, but I thought I'd mention it.)