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  2. Double-stack rail transport - Wikipedia

    en.wikipedia.org/wiki/Double-stack_rail_transport

    Double-stack rail transport is a form of intermodal freight transport in which railroad cars carry two layers of intermodal containers. Invented in the United States ...

  3. Well car - Wikipedia

    en.wikipedia.org/wiki/Well_car

    Each unit of a double-stack car contains a single well; they often are constructed with three to five cars connected by articulated connectors. The intermediate connectors are supported by the centerplate of single trucks, often a 125-short-ton (112-long-ton; 113 t)-capacity truck but sometimes a 150-short-ton (134-long-ton; 136 t)-capacity one.

  4. Double stack - Wikipedia

    en.wikipedia.org/wiki/Double_stack

    Double stack may refer to: Double-stack rail transport — trains with two layers of containers. A guitar amplifier configuration; Dual IP stack implementation, in ...

  5. Double tracking - Wikipedia

    en.wikipedia.org/wiki/Double_tracking

    Double tracking or doubling is an audio recording technique in which a performer sings or plays along with their own prerecorded performance, usually to produce a stronger or bigger sound than can be obtained with a single voice or instrument.

  6. Intermodal container - Wikipedia

    en.wikipedia.org/wiki/Intermodal_container

    It was 8 ft 6 in (2.59 m) long, 6 ft 3 in (1.91 m) wide, and 6 ft 10 in (2.08 m) high, with double doors on one end, was mounted on skids, and had lifting rings on the top four corners. [19] After proving successful in Korea, the Transporter was developed into the Container Express (CONEX) box system in late 1952.

  7. Costco: How To Double Your Savings and the Art of Coupon Stacking

    www.aol.com/finance/costco-double-savings-art...

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  8. What Is Coupon Stacking — And Why Should You Do It? - AOL

    www.aol.com/finance/coupon-stacking-why...

    Coupon stacking allows savvy shoppers to redeem more than one coupon on a single item purchase. However, it’s important to note that digital coupons do not count for additional savings.

  9. Rolling highway - Wikipedia

    en.wikipedia.org/wiki/Rolling_highway

    The technical challenges to implement rolling highways vary from region to region. In North America, the loading gauge is often high enough to accommodate double stack containers, so the height of a semi-trailer on a flatcar is no issue.