Can't recall what this building is either, so I'm throwing it in the support structures. :P
And a comm tower variant, with a slightly modified color scheme.
I've added one with a hint of green. That one may be good for continuity with the robot command center, which also has a small bit of green.
Updated the underground tubes to the new materials and made them a little heavier.
I like that you have an eye for detail.
As a bonus, do you think you can make an Easter egg reference to the Simpson's monorail episode? ;)