"Mizter T" wrote

And where was Snow Hill station - was it located under Holborn Viaduct
station?

Yes - opened 1 August 1874, renamed Holborn Viaduct (Low Level) 1 May 1912,
closed 1 June 1916. Apparently until around 1960 it was possible to push on
a unlocked door on the concourse of Holborn Viaduct, descend some dark
steps, and end up on the disused platfroms of teh Low Level station. There
was also an entrance from the north side of Holborn Viaduct (street0.

Peter