A quick query: what's the best way to do this trip, or similar trips,
in the NW, which involve a combination of the Central line and Pic
line? Since there's no interchange station, walking from Hanger Lane
to Park Royal seems like an option. I'm prepared to consider Tube,
Busses, or NR.

Here are some possibilities I've discovered:

1. Ruislip Gardens - Hanger Lane (Central), Hanger Lane - Park Royal
(walk), Park Royal - Ealing Common (Pic), Ealing Common - Chiswick
Park (Dist).

2. Ruislip Gardens - North Acton (Central), North Action - Ealing
Broadway (Central), Ealing Broadway - Chiswick Park (Dist).

Not too sure about the following:

3. Ruislip Gardens - Greenford (Central), Greenford - Ealing Bdy
(NR, Thames Trains, the 08:25 seems to be the obvious choice!), Ealing
Bdy - Chiswick Park (Dist).

Any routes I'm missing? How about busses? I don't mind the form of
transport, just want to get from A to be as fast as possible. Also, is
a travelcard valid on this NR route?