Color is not claimed as a feature of the mark.
The mark consists of stylized wording "TRANSIT" with a white line intersecting the middle of the letter "S", continuing in the letter "I", with a white circle on the line in the middle of the letter "I", a white line continuing into the final letter "T", with a white circle on the line in the center of the letter "T", a white line continuing to the edge of the letter "T", where the line changes to grey and is intersected by a grey circle, then a grey line, another grey circle, and a final grey line. All circles are the same size.