I made a layout entirely with RC track to utilize the cross over track segments, however I did not like the RC trains. I decided to modify this set as well as several others, using the RC car bodies as passenger cars.
This one was fairly simple to do, I used 1x2 plates to mount the battery and IF transmitter.
Then I redesigned the top of the train so the transmitter was visible.
I use this train car as the rear car so that the conductor can be seen "operating" the train.