With the help of a viewer, I investigate the issue of derailments, the kinematic coupling system that causes them and a modification to the system without dismantling the entire body.
Melchester Model Railway
https://youtu.be/pjYxm8Wt4PM
Music:
Ballgame by Kevin MacLeod is licensed under a Creative Commons Attribution 4.0 license. https://creativecommons.org/licenses/by/4.0/
Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100313
Artist: http://incompetech.com/