 Fast / Slow Line Layout
"Clive D. W. Feather" <clive@on-the-train.> wrote
>
> The GER (Liverpool Street), the MR (St.Pancras), and the GWR
> (Paddington) went for paired by use. The GNR (King's Cross) and the LSWR
> (Waterloo) pair by use at the terminus but then use a single-track
> flyover (at Belle Isle and Wimbledon respectively) to switch the lines
> around and run paired by direction along the main line.
The Belle Isle flyover was, until the 1970s, only used to access the goods
yard, and all passenger trains had to cross everything else in the station
throat (though suburban trains could go down to Moorgate via the Widened
Lines to avoid conflicts with expresses). The Wimbledon flyover was only
built in the 1930s, and before that fast and slow trains for the SWML had to
be sorted out in the Waterloo throat.
>
> Finally, the Metropolitan Line from Finchley Road to Harrow-on-the-Hill
> is arranged UF, US, DS, DF, UM, DM. The Marylebone pair are to one side
> for obvious reasons, but I'm not clear why they put the slows inside the
> fasts.
>
It has the advantage that Jubilee Line trains can be turned back at
Willesden Green or Wembley Park by running them into a reversing siding
between the Down and Up Slows (compare Welwyn Garden City, where a flyover
had to be built to take terminating trains from the bay platforms on the
Down Side to the Up Slow).
Peter
|