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Page 60. " in Trafalgar Square "
Trafalgar Square (mid 19th Century) by Pollard
Public DomainTrafalgar Square (mid 19th Century) by Pollard - Credit: James Pollard (died 1867)
  Trafalgar Square in Central London is the site of Nelson's Column and a popular venue for community celebrations and political demonstrations.

Follow this link for a glimpse of Trafalgar Square in 1890; it is difficult to tell whether the horse-drawn vehicles are trams or omnibuses.*

*Note that on p.64 of  Tipping the Velvet it says: There are no trams  in Trafalgar Square - only buses and hansoms.