Officials said the astronauts had overridden the spacecraft's automatic pilots to dock manually after a glitch in an engine caused the Soyuz's computer to stop the process.

"One of the engines had a fault which the computer considered was serious and it began to move the Soyuz away from the ISS at a rate of one metre per second," mission control official Vladimir Sovlov told RIA-Novosti news agency.

"We decided not to allow that and asked the crew to intervene. The commander judged the engine was working normally and we authorised him to approach in manual mode, which was carried out successfully."

Earlier spokesman Valery Lyndin told Interfax news agency that checks would be made to ensure there were no leaks in the airlock between the capsule and the space station before the crews of the two vessels joined up.

He expected the Soyuz crew to enter the ISS around 1610 GMT, three hours after docking.

US software pioneer Simonyi, 60, is the first person to travel twice into space as a tourist, having paid 35 million dollars (28 million euros) for the voyage.

He previously travelled to the space station in April 2007, becoming one of a select group of wealthy civilians, most of them from the United States, to have pioneered space tourism.

The professional spacemen on the flight are Russian Gennady Padalka, who is to become the space station's commander, and American Michael Barratt, who takes over as flight engineer.

The launch comes as Moscow is doubling the number of manned space launches to meet the needs of the expanding space station, with a second launch due in May.

The head of Russian space agency Rosksomos, Anatoly Perminov, said that for a period it could be the last time a space tourist would be taken on board due to increased demand on the programme, but had high praise for Russian-US space cooperation.

Simonyi's trip to space was the seventh by a space tourist since the programme was launched by Roskosmos and US firm Space Adventures in 2001.

But plans to raise the number of crew for the ISS from three to six from May, meaning there will no longer be a spare seat for a tourist on future missions.

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