题目内容

What are the types of different rails according to the conversation in U4?Usually, there are two operational steel rails, monorail, cog rail or _______ etc.

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更多问题

Sometimes there is only one single rail for the train to run, which is called ____.

A cog rail or a rack rail is a railway with a ________rack rail, usually between the running rails.

The trains are fitted with one or more cog wheels or ______ that mesh with this rack rail.

The rack rail is used to make the trains to run on a _.