Here is a track diagram. I used different colors for each of the loops to try to make them easier to tell apart. The table size is 12' x 15', with a 4' x 3' cutout in the lower left corner for the control panel. The table height is about 42 inches. The minimum curve is 42" diameter. I should have made the outer loop O72. The numbers indicate where each picture was taken from. The image is mapped so you can click on the picture number to take you to the corresponding picture.
The outer loop, shown in green, rises from the table height (at the lower left corner) to about 6 1/2" above table height (in the upper right hand corner). This results in a 4 to 4 1/2 % grade, which is a little too steep. I really have to have the train put together properly (heavier cars in the front) to avoid accidents.
The inner loop, shown in blue, rises from 3" above the table height (in the upper right corner) to 6" above the table height (in the lower center). The grade is about 2-3%, which is much more manageable.
The oval, shown in red, is at table height.