It was clear that York's engineers had failed to conquer the problem of how to keep their battery from discharging too fast.

For unknown reasons, the engineers have failed to arrive at a solution.

Both fail, but the engineers and politicians fail less often.

The engineers failed to enter it, but they did make it into another.

"If the engineer fails to respond," she continued, "the train stops automatically."

However, the engineer failed to reset it to "auto" on completion of the test.

They bring a train to a halt if the engineer fails to respond appropriately to traffic control signals.

The mission failed when the required engineer failed to show up at the designated meeting place.

The train is stopped even if an engineer fails to notice a signal along the track or inside his cab.

In years past, engineers failed to develop repair kits after growing pessimistic about the chance of success.