Overhead power lines had been put up for the Heathrow Express to run, which obscured the signals even more.

Heathrow Express has provided flight information display screens and self-check-in facilities for airline passengers.

Unlike the Heathrow Express, it will not provide a seamless "one-seat" ride.

Until 2012, free transfer was not possible between terminals, in contrast to the Heathrow Express.

Mr Lamont also announced that the £300 million Heathrow Express line would proceed.

From 1993 to 1998, it was use as a base for the electrification programme for the Heathrow Express.

The Heathrow Express travels, and doesn't stop, at a high fare.

Since its opening, Heathrow Express has been generally well received, not least because steps were taken to reduce the environmental impact of the train line.

Through tickets involving Heathrow Express and London Underground are also available.

Alternatively, you can take the Heathrow Express to Paddington Station, which takes about 15 minutes.