Thus the beds are perpendicular to the side of the train, in contrast to roomette berths, which are parallel to it.

Twinettes often have their own shower, toilet, sink, mirrors, chilled-water fountain, wardrobes and a picture window.

[3] Occasionally twinettes are about the size of a roomette, with both bunks, one on top of the other, filling most of the floor space of the compartment, replacing two seats facing each other.

In this case, the overall floor-plan of the sleeping car is similar to roomettes, not the twinettes described earlier, which are more commonly found only in first class.

This much more cramped arrangement is more likely to be found in economy-class sleepers on very long-distance trains requiring more than one night's travel.