There were nine vans coded JCP, numbers 1 - 9. They were converted from steel bogie vans coded _CP_. The conversion were done in the late 1960's and replaced the ZJP vans which were recoded to ZLP_.
The vans ran on interstate trains between Melbourne, Victoria and Adelaide, South Australia.
In the mid 1980's, the vans were no longer required in Joint Stock service and were recoded back to the CP class.