It seems a lot of forum contributors don't understand what a captive market is. Commuters to London are a captive market to rail - there is no reasonable alternative for many commuters to get to work. There is a reason why the Major Government introduced regulated fares as a by-product of privatisation. It is to prevent the TOCs from 'profiteering' from limited choice.
In a 'competitive market' between transport modes, the potential main travel modes for a commuter going to work may be:
- Walk
- Bus
- Train/Underground
- Light Rail
- Car/Taxi
- Cycle
Say I want to travel from Southall to Bank so I arrive by 9am. If I walked it would take around 5 hours to walk 13 miles - clearly not feasible. If I took the bus, I would need to take 3 buses which would take around 2 hours. Cycling would be slightly faster at around 1.5 hours. If I drove to work, it would take over an hour during peak times. If I took the train and then underground it would take about 45 minutes.
So, on journey times alone, the only feasible options for me are the railways, car, and maybe cycling.
However, most people, including I, feel uncomfortable cycling in London due to the lack cycling provision and may not have the energy to cycle 13 miles non-stop. With the car, due to the lack of parking in central London, it is not feasible for me to drive to work in Central London and then park for between 9am to 5pm.
So the only feasible travel option for this journey is the railways. The above situation is repeated for many suburbs, such as Richmond, Croydon, Willesden etc, to City journeys within Greater London. The railway is the only option for many commuters.
One has to remember that the railways are primarily used by people with higher than average salaries. I don't have the figures for commuter travel, but it is estimated that around 50% of all journeys on InterCity trains are undertaken by people living in the top 20% income households.