Hi - it's me again, and on the same old mission

Once again I'm looking for a photo that someone may be kind enough to allow me to use in a blog post. I'm looking for anything to do with coal hoppers (trucks, as we called them).
I'm putting a lot of stuff from my childhood and teens down for posterity, and this particular post is all about illicitly riding on the coal hoppers that ran from Bates' to the Bella in my early teens. It's not something I'm proud of, and I shudder at the thought of the danger I was putting myself into, but it was part of my growing up (and I had plenty of confederates alongside me).
I also detail another trackside activity from that era that I was never responsible for, the tipping of coal trucks (as we called it). This was carried out by adults who needed money for beer at the weekend. They would run alongside the truck and somehow turn the lever that opened the hatch in the floor, allowing tons of coal to spill on the line.
I believe it's important to give a
warts and all account of growing up at that time (1970s), and a suitable image would make the piece complete. I have uploaded the post with a free-to-use image of a Gronk diesel shunter with the black and yellow chevrons, that used to give me excited butterflies when I saw them appear under the bridge on Cowpen Road, but I believe that posterity would benefit from something more authentic, particularly a hopper with the grab bars and that handy steel step that helped us aboard - colour or monochrome.
Anyway, thanks for reading, and please get in touch if you can help.
Joe