I been work on this nearly 2 year now. Snice Badspot released of Obj to Blb Converter.
I use google sketchup models. I did gave to Barnabas did test on my model at google sketchup. he said, " They are fine" I think It mess up something.
You all might be wondering, how are we going to pull the turning off.
Well, we will make the model's joints rotated on the sides so that as it goes,the wheels on the sides (that will be invisible) are going to support the cart in place as it turns.
How mine cart work on curve track? My idea wheel add on the mine cart model will look like this.

This RRT (rail road track) for fits to Gold Mine Cart.

I build brick to brick give me idea to design the model would look like that.

Here idea: make 5 type:
N-Scale Straight and track spawn.
6x8x4
6x16x4
6x32x4
6x48x4
6x64x4
6x16x4 Spawn
N-Scale Curve rail road track.
16x16x4 Curve
32x32x4 Curve
48x48x4 Curve
64x64x4 Curve
HO-Scale Straight and track spawn.
8x8x4
8x16x4
8x32x4
8x48x4
8x64x4
8x16x4 Spawn
HO-Scale Curve rail road track.
16x16x4 Curve
32x32x4 Curve
48x48x4 Curve
64x64x4 Curve
Ramp TBA
This my design should look like this.


Also, I have added a brick selector for the rail road track.

Current work on this of the picture below.


I need someone help me with this less time.
2 Type Size of tracks are N and HO
1.N-Scale fit for Mine cart or toy trains.
2.HO-Scale fit for big trains, subway and etc.
Feel free Discuss and share our feedback. Do not make negative posts, please Thank you.
-Update news-
Furling- Model- Railroad Track, carts, trains and beta tester.
[GSF]Ghost - brick maker, vehilce export to DTS, BLB files and beta tester.
New Roblox Vehicle.

Roblox Tire.

Above picture, I made very first vehicle.
I was plan make this:


Above the picture come from roblox.