Twin unit

A twin unit or twinset is a set of two railroad cars or locomotives which are permanently coupled and treated as if they were a single unit. A twinset of cars or coaches can also be called a twin car.

In US passenger railroad parlance, twin units are also known as married pairs. On passenger railroads, light rail, and monorail services, married pairs may have machinery necessary for full operation of the cars split between them. Items that are typically shared include transformers, motor controllers, dynamic braking grids, cabs, current collectors, batteries, and air compressors. This provides significant savings in both cost of equipment and weight, which increases performance and decreases energy consumption. The cost of operating such a pair may be slightly higher when the extra car in such a pair is not needed to meet level-of-service demands at a particular time.

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Twinset

A twinset, twin set or sweater-set is a matching set of a cardigan and a (usually) short-sleeved jumper or pullover. The twinset first appeared in the 1940s and is now considered a classic wardrobe staple.

Description

The classic twinset is knitted in wool or cashmere, though modern interpretations can be knit from synthetics such as acrylic. The under-sweater is usually worn tight-fitting, with the cardigan unbuttoned to reveal accompanying jewelry, most typically a string of pearls.

Twinsets have been associated most closely with women's work wardrobes during the 1950s and 1960s, particularly in secretarial work or teaching, but were occasionally viewed as too casual for more conservative workplaces where dress suits were preferred. However, their popularity was largely driven by Hollywood stars such as Grace Kelly, Marilyn Monroe, and Audrey Hepburn who were frequently seen wearing them on and off the set.

The twinset is often chosen by costume directors and designers in the modern film industry to portray a character's conservatism or frumpiness. On the other hand, interest in the twinset returned thanks in part to the pink set worn by Elizabeth Hurley in the 1997 film Austin Powers: International Man of Mystery.