I recently inquired about Kadee #809 magnets unwantedly activating Lionel claw couplers. You can see the post HERE.
I have since discovered a remedy so that you can run rolling stock with Kadee and claw couplers without the claw couplers being activated. It is a VERY easy fix:
Step 1: remove the truck from the car and place the truck upside down.
Step 2: with small pliers, SLIGHTLY bend the bottom part of the frame UP on the front of the truck:
Step 3: test on the magnets, it it still activates, repeat step 2.
Step 4: Test the claw coupler pushing on the hidden tab. Then close the claw with your finger. If the claw does not close back up, move on to step 5.
Step 5: using the pliers SLIGHTLY bend the metal activation piece along with the bottom part of the frame UP on the middle of the truck:
Repeat step 5 if the claw is still not closing.
Step 6: refasten the truck to the car.