The "REM 5000" was the last two-axle refrigerated freight car for JNR and was manufactured between 1964 and 1969. The shape of the roof differs depending on the time of manufacture, and is roughly divided into the early type (5000-) and the late type (6000-). It is characterized by better heat retention than the existing type, and a blue belt was wrapped around it to distinguish it from other types for PR.