Everyone has their opinions, and it's no surprise that the owners of the airport would argue in favour of the Heathrow Express. However, they don't know how many passengers would choose an alternative method of transport, and Crossrail will surely increase the total number of people going to the airport by rail.
As for speed, the Airport Express in Hong Kong takes 24 minutes from Central to the airport (two stops, no toilets, but there is luggage space and probably it's a bit more comfortable). So 22 minutes from Paddington or 26 minutes from Bond Street shouldn't be a problem.
The few times that I have travelled on Heathrow Express I have generally seen two types of passengers:
1. Business people on expenses
2. Overseas tourists who don't realise that there are cheaper ways to get into town.
Group 2 will benefit from a well publicised lower cost Crossrail option. Group 1 will take Crossrail if it is more convenient for them or stick with the Express if they regard that as their better option.
It all adds up to a significant decline in usage of the Express service, perhaps to the point where the service is withdrawn on commercial grounds. Certainly under a centrally planned railway it would be got rid of as a partial duplication of the new Crossrail service.
I think it should be accepted that Heathrow Airports understands its customers and their needs quite well - they are, after all, its business. The figures quoted in the Minutes referred to in my post concerning modal splits between rail and road were not plucked out of the air but based on an on-going series of surveys about origins/destinations and modes of surface transport used to reach and leave the airport. But of course nobody will
know for certain how traffic will split until the alternative services are operating.
Paragraph 22 of the Minutes states,
inter alia:
Theo Panayi indicated that many in-bound passengers make decisions about onward travel as they walk out of the baggage hall. Tickets for the Heathrow Express services were now sold in the baggage hall. The added advantage of encouraging passengers to use the service is that once they have tried it they are more likely to become repeat users. Simon Earles commented that at peak times passengers often had to stand on the Heathrow Express.
One could argue that Heathrow Connect tickets should be as readily available in the baggage halls as the HEx tickets. However even if they were, because part of the cost of both types of tickets is a component which services the cost of building the tunnels between Hayes and the airport and the airport Terminal stations, Heathrow Airport is indifferent as to whether the passenger takes HEx or HConn as far as the infrastructure cost is concerned. HAL
is interested in making the passengers' onward journeys as hassle-free as possible.
I am not convinced that Crossrail alone, even if the frequency doubles compared to Connect, will very significantly increase the number of passengers travelling by rail between London and Heathrow. Until a third runway is built
Heathrow is capacity limited, it already runs at about 98% of its theoretical capacity for aircraft movements per year so very few
additional flights - and therefore air passengers - are likely. There will of course be a gentle increase in capacity as smaller aircraft are phased out but this is a process which takes years. The geographic spread of the sources and destinations of the passengers is also unlikely to change quickly so the addressable market post-Crossrail will not be greatly different to the current one. The same paragraph of the Minutes also states that:
Heathrow Express currently carried 5.5 million passengers per year and Heathrow Connect carries 400,000 passengers.
Suppose that doubling HConn's train frequency and extending it through the Central Line corridor in London
triples the present passenger count (to 1.2 million per year), this would still leave HEx carrying 4.7 million people a year assuming there is no growth in the air passenger market.
Two further points:
- HAL expects Crossrail to take traffic from the Piccadilly Line rather than HEx
- Extending rail services to the west and south-west of the airport would address a new market which is poorly served by rail at the moment and increase rail's share of the total number of people travelling to and from Heathrow.
Quantitative data is very useful to help separate 'conclusions' from 'opinions'.
Note: added last but one paragraph with bullet points in edit.