Lyrics Ship or Sheep - at the railway station

(Mr Grey is waiting at the railway station for a train.)
Mr Grey. Hey! This train’s late! I’ve been waiting here for ages.
Porter. Which train, sir?
Mr Grey. The 8.18 to Baker Street.
Porter. The 8.18? I’m afraid you’ve made a mistake, sir.
Mr Grey. A mistake? My timetable says: Baker Street train —
8.18.
Porter. Oh, no, sir. The Baker Street train leaves at 8.08.
Mr Grey. At 8.08?
Porter. You see, sir, they changed the timetable at the end of
April. It’s the first of May today.
Mr Grey. Changed it? May I see the new timetable? What does it
say?
Porter. It says: Baker Street train — 8.08.
Mr Grey. Hm! So the train isn’t late. I’m late.