The 157 series fleet included a dedicated imperial train car, built in 1960 and numbered KuRo 157-1, which could be inserted into 157 series formations for use on imperial train workings.
The 157 series fleet included a dedicated imperial train car, built by Kawasaki Sharyo (present-day Kawasaki Heavy Industries) and delivered in June 1960. Numbered KuRo 157-1, the car could be inserted into 157 series formations for use on imperial train workings.