Several weeks passed before even the power units could be ordered and the first work on the ship started.

This is particularly true when the extra power units are in the middle of the train.

After all, we've been running for a much longer time since we charged our power unit.

Why, just the power unit alone might provide the answer to our energy problems.

That surprised everybody, for the power units had gone dead long ago.

There is a door on each side and the power unit in the back.

The sets came with either a 6-volt or a 12-volt power unit.

The power unit was replaced with a new one, which tests showed to be fine.

Could you suggest a suitable power unit to a give this?

For one thing, the power unit was not well shielded.