The "rust" on T2 is just the original red paint showing through the black. At one time Six Flags planned to re-theme T2 as Batman, even going as far as to paint it black. However due to reasons unknown they halted the re-theme.
Yeah I should have mentioned that this is my own version of SFMM, on batman the way I have the ride laid out made this a better option, plus I plan to add a themed foot copper there. On Goliath well...... but thanks for the comments, this is no where near completion.