Why there are cooperated bus show in the data Greater Sydney GTFS?


#1

Hi there,
May I please inquire that why there are two buses running together as shown in the picture below:
like the route number 422, there are two same data, means that at the time 5:50 am, there were TWO buses arriving at the first stop (-33.8981323281766, 151.178491291201) of the routeing line, while, the only difference is that the first three numbers (such as 357 and 358 for first two line of data highlight in yellow) are different.


may I also please ask that what do those first three numbers mean? and why there are two buses running together while the scheduled timetable is not, as shown in the picture of the bus 422 timetable?

Many many thanks