Syberia stuck with leaving train station

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Have Oscar and train wound up and ready to go except Oscar wants some cargo into luggage compartment.
Tomb needs key to open, but Kate gives me the impression there is another opening. Have already gotten a jiggling in that area by using the punch cards in the bell tower.
Momo wants drawing of Mammoth. I think the paper and pencil may be for tracing, but where IS the mammoth picture? In the cave where Anna and Momo left a toy mammoth as children? If so, how do you get to the cave?
Gate at far left of town street is locked.
Large key on side of dresser in rectory is jammed. Am I supposed to get this key out? Obviously, since I used the punch cards, I already found small key to open dresser.

I don't want answers to all of these stuck parts. Just lead me to the area I need to solve next with kind of a clue instead of an answer, please please?

Hmmmm....dressers can be good places to hide things. Sometimes there are hidden spots that can only be accessed if you turn the key just where you notice the hidden area. Try opening the drawers again....in the church dresser. Notice anything strange in any of the drawers? Towards the back of a drawer? Hmmmm.....is the big key on the side of the dresser jammed NOW?

As for the Mammoth drawing...have you looked in every nook and cranny in that room? Sometimes you have to turn on the lights to clearly see what kinds of scratches and stains there may be on your walls.

AND....have you not been up into Anna's office in the factory? There is something there in the curio cabinet that you need to take along on your journey...and don't forget the little mammoth either. They have their own special places to ride on the train!