About collection tags
Each object from our Collections comes with a set of tags, which describe what the object is and how it relates to the rest of the Collections. It's very similar to the way photographs are tagged on Flickr, or videos are tagged on YouTube: so the Flying Scotsman might be tagged with 'engine', 'East Coast', 'locomotive' and so on.
If you click on a tag – for example, 'locomotive' – you'll be taken to a search page showing all the objects that share that tag. It's a quick way of moving around the Collections and finding the objects you're interested in – and stumbling on objects you might not even have realised were there.