real train day

Today I want to visit a Chinese herb doctor my friend recommended and took kids with me in the train. Zoe was really excited sitting in the real train. She is very curious about everything happening in the train, such as the map, the signs and even the anouncements!!
The first time Zoe didn't hear the anouncement very clearly so she asked me what did it say? After the train gone past few stations, Zoe could repeat it without missing a word : The door is closing, please stand clear. But then all of sudden, Zoe made a comment, "mummy, the door is not listening, it doesn't close, it should close now" I could only reply : The door is listening, the door is just a bit slow "