Over the years, she has witnessed many changes in tram history - from the design and features of the vehicle and interior fixtures and fittings, to the control system.

'In the past, operating a tramcar required more physical strength as the vehicle was driven by a mechanical control system.

'Nowadays, all tramcars are equipped with electronic-computerised technology. So strong physique is no longer a big concern,' she said.

Ms Yiu loves her job.

'Even if I won the Mark Six, I would still come back to work,' she said.

'It is a wonderful experience to drive with a gentle breeze puffing on your face, as well as greeting the many young smiling faces after school. I hope I can keep my job until my retirement.'

She has also had some interesting experiences.

'One day last year, I met an unusual passenger who had a free ride with me for more than two hours - a parrot,' she said.

'It was perched on the right wing mirror all the way from Quarry Bay to Sheung Wan and then back to Shau Kei Wan.'