元、住宅・都市整備公団 2000 系です。公団線の開業に際して製造されました。後に北総開発鉄道の延伸により、京成線や都営線に直通することになりました。
This stock was originally designed for Urban City Development Organization (UR), which opened the Kodan Line. Later UR sold the train Line to Hokuso railway, and the stock also become a member of Hokuso Line. The stock was characterized with stainless body and red-green outfit.