"Tom Anderson" wrote in message
...

How about killing the Chiltern services to everywhere inward of Denham (or
perhaps West Ruislip, for interchange), so that the services left can run
fast all the way into Marylebone, and then speeding up the Central Line's
services from these outer stations by taking over the GW Perivale line run
some trains fast, say from Greenford to East Acton (via new links at both
stations), possibly with a stop at Park Royal. Essentially, you have the
Central running inner suburban and 'middle suburban' services.

And how would the freight trains that use the Greenford loop and the ex-GW
main line to get to the Chiltern route then do so?