After I watched the firework show last night, I took route 600 to go home.
Some MTR buses that can serve on the special routes may be standby to serve route 600, no matter single deckers or double deckers. I took #903 to go to Siu Hong Station.
When I came to stop, I saw the bus before #903 is a bus numbered #6xx. Because I would like to try a #9xx bus, (since there is no E200 buses served in the city area ) I took the next bus listed above.
However, the bus almost broke down when it left the stop near Tuen Mun Pier.
Finally, it left the stop successfully after it has been tuned for a few times.
Sorry for some information is incomplete, or even the information may be wrong. Please point out if there is mistake.