As the number of type 70 cars constantly increased since then including Kuha type 76 cars introduced at the end of 1954, they were dubbed 'Chabozu' since all of them were painted wine color.
その後も70系の増備は続き、1954年末からはクハ76も登場、ぶどう色一色で登場したため、「茶坊主」の愛称が付いた。