The timetable change is due to the refurbishment of London Bridge station, part of Thameslink's £6.5bn programme to increase capacity on the line by more than 60% during peak periods.
The i covers the "Meltdown on the railways" after timetable changes triggered chaos.
Since the December 2013 timetable change, most Birmingham trains now continue through to London via and.
Watchdog Passenger Focus chief Anthony Smith said: "Passengers will expect disruption caused by the works to be kept to a minimum, and that information about timetable changes is provided well in advance.
The changes will come into effect from 3 November and details of timetable changes can be found at www.travelinesw.com.
And he emphasized that the timetable would change if the economy grew more slowly than expected.
What is the timetable for change?
That's a revised timeline from an earlier plan that targeted the first half of this year, but since the product's existence hasn't yet even been acknowledged by Apple, that kind of timetable change isn't surprising.
With this in mind, we are reviewing the timetable for the change programme.
I'm not working from a script, and the timetable can be changed as we wish.
