Blueprints On How To Build A Sand Rail I Just Built The Castle In Kingdom For Keflings. How Do I Unlock The Blueprints On The Right?

I just built the castle in Kingdom for Keflings. How do I unlock the blueprints on the right? - blueprints on how to build a sand rail

He built the castle and the mayor is now a king. I'm the king nothing to do. But I have not yet received a selection of Gypsies or retailers to unlock the footsteps of the other blue. How do I get the mayor to ask questions about Gypsies or dealer?