A large two engine train was crossing America. After they had gone some distance one of the engines broke down.
“No problem,” the engineer thought, and carried on at half-power.
Further on down the line, the other engine broke down, and the train came to a standstill. The engineer decided he should inform the passengers about why the train had stopped, and made the following announcement:
“Ladies and gentlemen, I have some good news and some bad news. The bad news is that both engines have failed, and we have no power. The good news is that this is a train and not a plane.”