Setting up a tile set in Rpg Maker VX Ace

So I created a people mover for the game I am working on and I have a question about properly setting up the tileset so that the NPC will walk behind the railing but not over it. 

I can't seem to get images to post in here so I will submit the link. 

https://flic.kr/p/nCCJqJ

Would the bottom railing need to be on a different tile set from the main "people mover" tiles? or is there a way to force the program to do this all on one sheet?

The pink blob represents an NPC.

Thanks. 

When I designed a pew set for a church tile set I had the same question.  This is what I did:

First I had the completed pew on the tile set:



Then I cut off the "back" and set it as an event, "through" and "above the player".  The back portion alone is what you will see above the player making them behind the "back" of the seat without seeing the entire portion below them.



In order to get an npc to move through it, they too must be marked as through.  As I did with those occupying the seats.  When a player moves through it they will be behind the railing as well.

This can be accomplished all on the same tile set but needs to be a separate event for each part of the railing passed through the npcs and players will be walking behind.  

Do you intend to animate the people mover?

Brilliant! thanks for the tips Palladinthug-sama