Replacing railway ties by manpower?

As usual, it would cost 15 minutes to replace one-pieces railroad ties by experienced manpower, but if use JingGong machinery only 2 minutes and meanwhile reduce the cost around CNY10. One JG machine can replace 500pcs ties if working in two classes operation within one day, that means 15 units machine can replace the 4km railroad ties per day and request 2 manpower and 1 machine operators.

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