Rhodebars are an autosexing breed as developed by Prof. Punnett & others. They made quite a few autosexing breeds at the time. The idea being that they breed true & the chicks have different coloured down at hatch. I believe they deveolped with the commercial poultry in mind, prior to the commercial hybrids.
One can make birds which are red all over & barred.
One can make birds which are red all over & barred.