One of Jim Barrett's back shop videos coverd this tipic. I purchased it but after seeing the alterations needed on the cars I decided not to do this.
I am considering using Williams by Bachman remote control opportating cars instead of my post war opperating cars. The Bachman cars have no slider shoe, thay use center rail roller pickus. They have a good looking log car and dump car. I do not recall, but I think the K Line milk car was remote contro also.
Hope this helps,
Richard