Where is the trolley ding?

The tram Xiaoding departs every day,
Starting at six o'clock in the morning, ding ding ding ding——
It was busy until midnight.
However, Xiaoding became increasingly unhappy...
"I'm just an old-fashioned tram that can't keep up with the times... I'll probably be eliminated soon, right?"

★ A picture book story with the classic Tram 120 as the main character and his self-worth.
★ A Hong Kong story that warms the hearts of children and parents.