Why so slow one?

Today is just another day, the only difference being me going to Mid Valley. Nothing much, met my friend, ate some food and walked a bit. Then I took KTM on my way back. I was totally out of luck I say, having to see myself missing the train right in front of me. Oh well, no luck thats it.

While I was waiting for the train back to Petaling, I read the book I bought just now. To be honest, the lights were dim and I can barely read. But that was the only thing to fill my emptiness for a full 30 minutes train wait.
The crowd is slowly seen as it is almost end of work time for most commuters. Then two foreign girls (me guessing Japanese) were asking the girl (or lady.. me is duno) something.

"What time is the train coming?"
"Four thirty six"
"What???"  

It was the word what that caught my attention, for I felt that the girl pronounced 4:36 clearly and accurately.  I  involuntarily moved my head up, somewhat engaging to the talk, without a word though.
"Four...Thirty Six"
"Ohh.."

"I thought the train comes every few minutes..."
"Erm... no..the train comes every twenty or thirty minutes."

I was about to say a word, but it didnt happen. Deep in the abyss of my heart, I was just too ashamed to mention about how regular the train comes, even during peak hour. All I gave was a smile. I continued reading the book I bought after the the conversation ended.