My first experience of Airfix wagon kits was with my grandfather, when I was 4 or 5. He had been a guard with the LMS and later BR, and we sat at the dining table and built (well, he did anyway) the guards van kit. No idea what happened to it mind, but I do have a couple of others that I built subsequently. The tank wagon is very old, built when I was perhaps 11 or 12, has the original transfers, still no paint, except the red on the axle boxes, (no, I don't know why either!) Really should spruce it up some more... it has sprung buffers and Romford wheels and bearings fitted but plenty more work could (should) be done.
The brake van is a much more recent Dapol version; I have two of these but the other is still unpainted.
Almost forgot, there's this too...
...and somewhere I have an ancient Pug but I've no idea where it is at present!