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    please help my reading.

    Hi, please read the below paragraph. I don't understand the underlined

    part. I'd like to know what the underlined part mean in this context.

    And I think "unless" needs to be changed to "if" in order to maintain

    the flow. What do you think?

    Thank You.

    The distance between the rails of a railway track is called the gauge. About

    60 percent of the world's railways are standard gauge, which is 1,435

    meters. A few tracks have a narrower gauge. When you read the names on

    the cars of a long freight train, you are surprised how many different railways

    are represented.
    This would not be possible unless the cars were built for

    tracks of standard gauge.

  1. Mister Micawber's Avatar
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    Re: please help my reading.

    No, 'unless' has the oppposite meaning to 'if'. The tracks are standard, so cars from many different railways can use the same tracks. Therefore, one train often pulls cars belonging to a surprisingly large number of different railway companies. The names of these companies are written on each of the cars that belong to them.

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