I was able to disassemble my Thomas Remote Control using the above instructions. Very helpful. Controller and RF sections of the PC board are apparent. Unfortunately for me, I could not identify any cold solder connections in the RF section. I could try a heat gun to see if anything pops up.
Also, for the more detailed folks, there is a handy Channel Assignment chart inscribed on the PC board. So, if you are able to unnsolder/solder surface mount resistors, you could reconfigure a remote control to another channel. There are 3 channel selections available.