A simple idea would be to sell access to the quiet carriage as an optional extra when the ticket is bought.

一种简单的区分方法是，售票时提供安静车厢选项，乘客可选择支付额外费用在安静区就坐。

First, there is a sorting problem: some passengers end up in the quiet carriage by accident and are not aware of the rules.

一些乘客阴差阳错的坐到了安静车厢，而没有留意乘车守则。

Second, there is a commitment problem: noise is sometimes made by travellers who choose the quiet carriage but find an important call hard to ignore.

选择就坐安静车厢的乘客在途中接到一通无法忽视的重要电话，无奈之下发出了声响。

Passengers who are willing to obey the rules can choose the quiet carriages when booking their tickets, according to China's national railway operator.

据中国国家铁路运营商介绍，愿意遵守规则的乘客在订票时可以选择安静车厢。

Charging a price, even if just a token amount, means the quiet carriage becomes a service that fellow passengers have bought, not just a preference they have expressed.

即便是象征性收取少量金额，单凭收费这一行为，就意味着安静车厢不再是同行乘客的偏好之选，而是他们所购买的一项服务。

Wish the train could be less noisy? There might be a solution for you. The Beijing-Shanghai high-speed railway, one of China's busiest high-speed rail lines, will have " quiet" carriages starting from Dec 23, 2020.

希望火车噪音小一些吗？也许有适合您的解决方案。京沪高铁是中国最繁忙的高铁线路之一，自2020年12月23日起，车厢将“安静”。

Some people have pointed out that this kind of quiet environment should be offered in all carriages. They say that having quiet carriages might give people the impression that they don't need to be quiet in non-quiet carriages.

有人指出，所有车厢都应该提供这种安静的环境。他们说，拥有安静的车厢可能会给人一种他们不需要在非安静车厢保持安静的印象。