How do you say

I’m planning to take the train to Beijing in three months.

..in Chinese?

我打算在三个月后坐火车去北京。

wǒ dǎ suàn zài sān gè yuè hòu zuò huǒ chē qù běi jīng 。

How do you say "They plan to buy new furniture in three months." in Chinese?