Can you tell?

I have been searching around from the internet, and i found this series of print-advs about MTR. I still remember from last lesson, Robert teaches us how to decode the print-advs. There are only few ways to decode and understand the advertisements, and therefore, we know how to reuse the same "code", but to create another "new language". So, back to the topic, have any of you seen this series of print-adv before? Can anyone tell tat what kind of styles it has used on this advertisement? Is that pun?! Since, it uses the same word as a station name and also another meaning. It is pretty interesting and catch people's attention easier, but honestly, I personally do not think that the MTR company needs any promotions, since MTR is the transportation that people in Hong Kong needs everyday.