In order to meet London’s needs, London Transport is rapidly carrying out its great programme of improvements, which will be ready about these dates.

1939
June.   NORTHERN LINE.   Archway (Highgate) to East Finchley :  through trains between East Finchley and Morden.
October.   BAKERLOO LINE.   Baker Street to Finchley Road :  through trains between Elephant & Castle and Stanmore.

1940
January.   NORTHERN LINE.   East Finchley to High Barnet :  through trains between High Barnet and Morden.
January.   CENTRAL LINE.   North Acton to Greenford :  through trains between North Acton and Liverpool Street.
April.   CENTRAL LINE.   Liverpool Street to Loughton (via Woodford) :  through trains between Greenford and Loughton.
July.   CENTRAL LINE.   Greenford to Ruislip :  through trains between Ruislip and Loughton.
September.   NORTHERN LINE.   Drayton Park to Alexandra Palace :  through trains between Alexandra Palace and High Barnet and Moorgate.

1941
January.   CENTRAL LINE.   Loughton to Ongar :  and Leytonstone to Woodford via Newbury Park :  through trains, Loughton, Hainault and Ruislip (via Woodford), Hainault and Ruislip (via Newbury Park).
January.   NORTHERN LINE.   Finchley (Church End) to Bushey Heath :  through trains between Bushey Heath and Morden.
January.   METROPOLITAN LINE.   Harrow to Rickmansworth, widening :  Rickmansworth to Amersham and Chesham electrification.