Three Rivers

From Wikipedia : Rickmansworth () is an interchange railway station in the town of Rickmansworth, Hertfordshire, northwest of Central London, served by the Metropolitan line of the London Underground and by Chiltern Railways of the National Rail. It is one of the few London Underground stations beyond Greater London and as a consequence is in Travelcard Zone 7. The station is a good location to alight from to explore the Chess Valley.

From Wikipedia : Kings Langley railway station serves the villages of Kings Langley, Abbots Langley and Hunton Bridge, in Hertfordshire, England. It is a stop on the West Coast Main Line, 21 miles (34 km) north-west of London Euston. It lies almost under the M25 motorway, near to junction 20. The station and all services calling here are operated by London Northwestern Railway.

From Wikipedia : Carpenders Park is a London Overground station on the Lioness line, located between the Hertfordshire suburb of Carpenders Park and the South Oxhey housing estate, 3 km (1.9 mi) south of Watford Junction. The station is an island platform reached by a subway. This has exits to both the Carpenders Park (east) and South Oxhey (west) estates.

From Wikipedia : Chorleywood is a London Underground and National Rail station in Travelcard Zone 7 (previously zone B) on the Metropolitan line. The village of Chorleywood is in the Three Rivers district of Hertfordshire about 20 miles (32 km) from London. Chorleywood station is also served by Chiltern Railways, which runs trains from London Marylebone station through to Aylesbury.