Usually a red male chicken (often RIR) is bred to a female white chicken (like a Delaware) to create a sex-link.
Some have brand names at the hatcheries including Red Star, Black Star, ISA Brown, Hubbard, Gingernut Ranger, Comet, Cinnamon Queen. Here are the most common hybrids and the crosses used to make sex links in the hatcheries.
Black Star/Black Sex Link:
New Hampshire Red X Barred Rock.
Rhode Island Red X Barred Rock
Red Star/Red Sex Link:
RIR X Delware. RIR X White Leghorn.
RIR X Rhode Island White. Production Red X Delaware
Cinnamon Queen:
New Hampshire Red X Silver Laced Whyandotte
Golden Comet/ Gold Sex linked:
New Hampshire Red X White Rock.
RIR X Rhode Island White.
Gingernut Ranger (found in the U.K.):
RIR X Light Sussex
There are also autosexing breeds like the Plymouth Barred Rock. Normally the two sexes of pruebred BR can be distinguished at hatch by a mark on their head.