Christmas tree train spiral

[Pedro]

Hello everyone I'm Pedro from Portugal and I'm completely new to this hobby just know the gauges and some brands.
Since I was a kid always admired this hobby but my parents didn't have the budget for it so now after my first newborn son I really wanted to make a train climbing the Christmas tree but there is a lot of information and I was hoping that you guys could help me out.
First i was checking on Ho gauges but the minimum turn radius it's to high so I passed to N gauge, but now don't know which track brand should I buy i checked atlas code 55 tracks because they have a lot of curves sizes, so can someone help me out with tracks and steam locomotives for my project thanks in advance to everyone

 

[dennis461]

You have picked an extremely difficult project, good luck.

 

[Rico]

Yup going up is one thing, getting back down is another.
Well unless you run an rdc or trolley I suppose, still supporting it will be challenging.

 

[Pedro]

So for the tracks i went for Peco code 55 sl-300f, 34 pieces, for the locomotives i went for dcc Graham farinha 372-400 class J39 0-60 t.
The tracks elevation is 4 degrees hope the train can go all the way

 

[twforeman]

2% grade is usually the recommended max.

 

[CM-Fan]

I really want to see the end result of this project - best of luck with it. I would have to use an artificial tree and leave it up forever.