Not only is the Metropolitan line having new trains introduced, it is also having a new timetable.
The biggest change is that off peak ALL trains will call at ALL stations to thier final destination (fast Metropolitan line trains will only run in the peak hours). Chiltern will continue to run off peak fast trains but only, as now, every 30 minutes.
The proposed frequencies in the off peak are: --Aldgate- Uxbridge: 8 tph --Baker St- Watford (Met): 4 tph --Baker St- Amersham: 2 tph (plus 2 fast Chiltern) --Baker St- Chesham: 2 tph
I believe this is not a good idea as it would increase journey times to and from Amersham and would mean an incredible 16tph service at Preston Road/Northwick Park, which is is way too many!
"This station is Stratford. Change here for the Jubilee Line, Docklands Light Railway and National Rail services. This is a Central Line train to Woodford via Hainault. Stand clear of the closing doors."
It always is a Woodford via Hainault train... except when you actually want one!