"TC" wrote in message
...
I understand that maintenance work is necessary but it seems drastic to
isolate one whole quarter of outer London.

Chiltern Trains?

They're not exactly a lot of help for most people in NW London. First train
of the day, at 07:33 would mean I get to Waterloo with only 12 minutes to
spare - too risky, especiaaly as the NationalRail site says the train is
"unknown operator" !!
Thanks anyway,
Baz