The lowest two bits contain the code for the color scheme. Bit 2 of this byte is set to 0 in the original RCT. It is set to 1 in AA/CF and this can be used to indicate that this file is larger and that the track data starts at a different location.
| bit 1 | bit 0 | color scheme |
0 |
0 |
All vehicles are the same color |
0 |
1 |
Trains have different colors |
1 |
0 |
Each car has different colors |
1 |
1 |
not used |