Question

when is the next train from here to London？（six hours）

Answer 1

1、when is the next train from here to London？一般现在时态表示一种常态行为， the next train from here to London中train到站时间早有安排，所以没必要用将来时态

2、the next train will from here to london in six hours' time纯粹汉语式译法，will后加动词原形。