The Chinese Ministry of Railways has revised maximum height mark to qualify for children's discounted tickets from 1.4 to 1.5 meters.

If a child is taller than 1 and half meters, he or she won't be eligible for any discounted tickets . This has triggered public debate, with many calling it an unfair standard.

A commentary in the "Beijing Youth Daily" argues that the government should adopt a "dual standard", which means that both age and height can prove one's right to buy a discounted ticket.

It says that in some western countries, children between 2 and 12 years old can buy children's tickets regardless of height.

But "height mark" regulations, viewed as a convenient way to carry out this policy, were implemented in China decades ago and are seen by the authorities as an effective measure.

The commentary points out that the old standard excludes many children taller than 1 and half meters, which infringes on those children's rights.

The article suggests that the government should hold hearings before working out any regulations and calls it a necessary step to show respect to public opinions and at the same time avoid potential flaws in the new regulation.