All of those in one year is a little excessive. I think Oliver, Stepney, Toad, and two of the buildings you mentioned sound a lot more likely. It's funny that you mention the airport since it was an iconic location throughout Calling All Engines and seasons 10-12.
![](http://img2.wikia.nocookie.net/__cb20100619204345/ttte/images/5/5d/CallingAllEngines131.jpg)
I think the possibilities for more buildings are fairly wide, and I certainly hope to see more additions in the near future such as more stations, a coal hopper, or even a level crossing. The new buildings have received a very positive reaction from older and newer fans alike, so I imagine that most of them will sell very quickly.
![](http://img2.wikia.nocookie.net/__cb20100619204345/ttte/images/5/5d/CallingAllEngines131.jpg)
I think the possibilities for more buildings are fairly wide, and I certainly hope to see more additions in the near future such as more stations, a coal hopper, or even a level crossing. The new buildings have received a very positive reaction from older and newer fans alike, so I imagine that most of them will sell very quickly.