This product is an accurate representation of the green open wagons so commonly seen throughout the model series, and includes a clever coal load insert. I use these as both coal trucks and quarry trucks. I fill them with ballast or other stones to bring the model to life. They are most reminiscent of the green trucks seen in the classic series at Ffarquhar Quarry especially. They look great in a quarry set with an engine like Mavis, part of a goods train, or simply as part of the shunting yard. This product is a great addition to any layout and is personally one of my most favorite models!