We thought exactly the same thing when we first heard that. We were on our way from Leeds to Manchester Airport by train. The train we embarked on said Manchester Airport so we were on our way and nothing could go wrong.
"This is half of the whole train" the conductor said in Manchester Picadilly. ... Really? Is it? How interesting. Thanks for the info. People started to leave the train, they knew something we didn't. "This is half of the whole train" he said again, as if it explained certain principles of the universe. So I asked him if this train still goes to Manchester Airport. And guess what he said. "No, this is half of the whole train." I tried again. "This train doesn't go to Manchester Airport?" "No", he said. "Why did it say Manchester Airport then? And why didn't anyone tell us earlier?" "I am telling you now." He was quite lucky I already had our two humongous suitcases (fear us and our luggage!!!!) in my hands, so I couldn't hit him.
"This train is going to Whole, not to Manchester Airport." By which my wife understood finally "Hull". D'oh!
So we went to another platform to get our train to Manchester Airport. It was announced to leave at 17:59. When the train arrived at 18:04 I asked the conductor: "Will this train go to Manchester Airport?" He smiled and said yes. "Are you sure?" His answer was still yes. "That's what the last one said." "No, I am sure, this train will go to Manchester Airport". So we sat down and waited. At 18:15 I went back to his colleague. "Didn't that other guy tell us this train would go to Manchester Airport?" "Yes, he did," he answered. "Well, it looks like it does not. In fact this train doesn't seem to go anywhere," I pointed out. After he consulted with the schedule, the clock and the conductor we finally departed.
But we did arrive safely at home.