I installed two O gauge tracks that run parallel around the perimeter of my basement and i need help deciding what power I should use. Here are the details:

1. The sizes of each line is roughly 36' x 24' (theres two running parallel)
2. I used Lionel Fastrack
3. The lines are not connected together
4. I only have one CW-80 transformer wired to each line
5. I am using a CAB-2 to control the Legacy trains
6. I can run 3 trains on one line and 2 trains on the second line (not perfect but it works).

So i'm planning on crating multiple "blocks" and connect both lines

Should I purchase one ZW-L transformer which will give me 4 possible blocks or multiple 135 watt bricks for each block?

David