Model railway - "Proof of concept" 2' x 6' OO gauge layout - rolling stock

Here's the rolling stock that runs on the tight radius curves on the layout.
Flexi track is used for the layout's main loop which results in a 19" radius.
Coupling hooks are removed from some of the rolling stock to prevent coupling lock and derailments.
*Note
The last three trains are the ones that run on the back and forth shuttle service which uses standard first radius curves.