In article .com, Mizter
T wrote:

Most interesting. But what is the line in a tunnel that appears to lead
from Holdborn Viaduct Low-level station under Smithfields meat market
to Aldersgate (now Barbican) station?

The access to Smithfield GW goods station, Whitecross Street Midland goods
station and the Widened Lines to Moorgate. What you refer to as Hol(d)born
Viaduct Low Level is actually Snow Hill station, which is on the Thameslink
route (though not in use - there are office block piles through the
platforms).

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Jock Mackirdy
Bedford