So, I and @FinnishChugger have come up with an idea to update the episode pages in the wiki:
From here on out, each episode will contain a "Rolling Stock" section, listing each wagon and car that appears in the episode. Like the characters, they will have a "(cameo)" and "(debut)" next to them. Because rolling stock does talk, a "cameo" means that they are shown in the background and don't necessarily play a part in the episode.
Locations will also have "(debut)" next to them for episodes they first appear in.
Cast will now be using the Collum feature, splitting the UK and US cast side by side with each other.
Example: Can't Catch Koko