Dear Engineers! In this week's update we are making another addition to the group of entrance blocks. We've added a new block, the portcullis. It's modular, so it allows you to combine it with other blocks in various ways. It's also a compound block, so there are a large number of possible combinations. It's the last of the series of gate blocks that we've been adding over the past weeks.
https://www.youtube.com/watch?v=U8gV7SKnHmg
Full list of new features and fixes: http://forums.keenswh.com/threads/7384141