Overviews as requested:
Round A

Carts start by moving between the cliffs to the left and right of the middle
The tracks cross in an 'X' shape in the middle
It is a bit hard to see, but the tracks move through the building at the bottom
Finally emerging at the spawns on the left and right
Round B

Carts start inside the building, you can see the start line for the 1 position (0 position is obscured underneath a catwalk (but it is slightly further down from the respective 1 positions)
From the start the paths join together and progress outside, going up a ramp to get over the train tracks (crosses in the light gray building at the top)
Track goes in the enemy teams building (now on upper floor)
Progresses through, eventually to outside
Huge ramp down towards the cap points
You cant really see the cap points but they are below the B signs