BERMONDSEY  No Step Free Access - [1/15]
GREEN PARK  No Step Free Access - [2/15]
HARROW & WEALDSTONE  No Step Free Access - [3/15]
HEATHROW TERMINALS 2 & 3  No Step Free Access - [4/15]
HOUNSLOW EAST  No Step Free Access - [5/15]
KENTISH TOWN  Closed - [7/15]
TOTTENHAM COURT ROAD  No Step Free Access - [8/15]
VICTORIA  No Step Free Access - [9/15]
WEST BROMPTON  No Step Free Access - [10/15]
CALEDONIAN ROAD & BARNSBURY  No Step Free Access - [11/15]
KING GEORGE V  No Step Free Access - [12/15]
STAR LANE  No Step Free Access - [13/15]
MAIDENHEAD  No Step Free Access - [14/15]
SLOUGH  No Step Free Access - [15/15]
Elizabeth Line
Bakerloo
Central
Circle
District
DLR
Hammersmith and City
IFS Cloud Cable Car
Jubilee
London Overground
Metropolitan
Northern
Piccadilly
Thames River Services
Trams
Victoria
Waterloo and City
Woolwich Ferry
HEATHROW TERMINAL 4
  Busiest between 5am-6am and 1pm-2pm
DESTINATIONDUE
Heathrow Terminal 4 Rail StationElizabeth line2 sec
Abbey WoodElizabeth line40 sec
Abbey WoodElizabeth line41 sec
Heathrow Terminal 4 Rail StationElizabeth line30 min
Heathrow Terminal 4 Rail StationElizabeth line1 hr 
DESTINATIONDUE
Abbey WoodElizabeth line40 sec
Abbey WoodElizabeth line41 sec
Heathrow Terminal 4 Rail StationElizabeth line15 min
Heathrow Terminal 4 Rail StationElizabeth line45 min
Heathrow Terminal 4 Rail StationElizabeth line1 hr 15 min
PLATFORM UNKNOWNshow other lines
DESTINATIONDUE
Abbey WoodElizabeth line41 sec
Heathrow Terminal 4 Rail StationElizabeth line1 hr 30 min
Heathrow Terminal 4 Rail StationElizabeth line1 hr 45 min
Heathrow Terminal 4 Rail StationElizabeth line2 hr 
WHEN IS HEATHROW TERMINAL 4 BUSIEST?
How we calculate this data