These mini-Shinkansen lines are not formal Shinkansen lines legally as well as from the viewpoint of equipment, and basically are regular railway lines (these lines are called Shinkansen for convenience and for an image strategy for them).
法律や設備などの上では正式な新幹線路線ではなく、あくまで在来線である（これらの路線を新幹線と呼ぶのは、利便性やイメージ戦略上の理由である）。