Bus and train firm Go-Ahead said overall trading in the third quarter was in line with company expectations while its full year outlook remains unchanged.The group said it remained confident in the underlying strengths of its business. Revenue at its bus operations rose 7.9% during the quarter while revenue continued to grow in line with company expectations in the rail division."Overall, we continue to target a mid single digit percentage increase in passenger revenue growth for the full year in each of our three franchises," the group said in a statement.In North America, Go-Ahead's yellow school bus joint venture is making good progress for the start of its first contract running just over 100 school buses in St Louis, Missouri from September 2010.