But he didn't believe there had been any mechanical failure.

To begin with, at least, it would be put down to mechanical failure.

State of the art, too - never had a mechanical failure.

He was running well until a mechanical failure dropped him to 36th.

He said the only other possible cause appeared to be mechanical failure.

Because a mechanical failure suggests that people weren't doing their job.

But safety board officials said again today that they thought mechanical failure was most likely.

And if a mechanical failure didn't stop them, lack of fuel would.

There was no evidence of mechanical failure on the train.

Police say mechanical failure has not yet been ruled out.