How many metro trains are running at the same time across the London underground?

Question

How many metro trains are running at the same time across the London underground?

Answer 1

The Central line's 74 km (46 miles) make it the Underground's longest line. It serves 49 stations and requires 72 trains to operate the peak period service. Its total fleet of 85 trains.

Facts like these are available at TfL

Answer 2

Maximum number of trains required for scheduled Peak Period Service

                                                     AM                       PM

Bakerloo Line                                 31                          31

Central                                          77                           76

Circle / Hammersmith & City           30                            30

District Line                                   77                            77

East London Line                             6                             6

Jubilee Line                                    49                           50

Metropolitan Line                            47                            47

Northern Line                                  91                           91

Piccadilly Line                                76                           76

Victoria Line                                   37                           37

Waterloo & City Line                        5                             5

Total                                              526                         526

Answer 3

At peak times there are several hundred trains, travelling at intervals of 2-3 minutes, on the lines of the Underground.

At off-peak times the frequency drops to every 7-8 minutes so some trains return to the depot for servicing, etc.