In message , Nick Leverton
writes
There was an earlier loop at Charing Cross. You know .. the terminus
of the CCE&H.
To improve the interchange facilities at Charing Cross, the L.E.R.
Promoted a short extension of the Hampstead Tube under Villiers Street
to the Embankment, and work on this was begun in October 1911. The new
line took the form of a single loop under Embankment Gardens and the
fringe of the river from Cleopatra's Needle to Charing Cross Pier,
returning through a single platform built underneath the District
Railway Charing Cross station about 50 yards to the east of the Bakerloo
Embankment station. The District Railway station was rebuilt in
connection with this work to serve as an adequate exchange station for
the three railways. With the rebuilding, a circulating area was made
under the District Railway line with platforms that were connected with
the two tube stations by pairs of escalators. The Hampstead pair were
brought into use on 6 April 1914, simultaneously with the opening of the
loop line. The name Charing Cross (Embankment) was adopted on that
date for all three lines (District, Bakerloo and Hampstead) at the
interchange point and the old Hampstead station was renamed Charing
Cross (Strand). Just over a year later, on 9th May 1915, the
Embankment stations dropped the word Embankment and became Charing Cross
simply, whilst the Hampstead line station dropped the Charing Cross and
was called Strand only.

Quoted from "Sixty Years of the Northern" pages 21 and 22.
--
Clive