Lego Train-Compatible Covered Hopper Car

Well, it's a Covered Hopper car that can run on Lego Tracks and be pulled by other lego rolling stock.

This rolling stock provides two choices for wheel truck/bogey. The one that ends with "pin" is to be used with a 2mm x 45mm Dowel Pin as the axle, with the wheels pressed on. Alternatively, the other wheel truck/bogey parts that do not end with "pin" use M3 screws as the axles. Both work well. Generally, the "pin" provides less rolling resistance, but more noise. So, it's a tradeoff. Also, you're more likely to have M3 screws.

Most non-moving parts on this build are glued together. I recommend plastic model cement. Everything else uses M3 screws.

You'll also want 10mm x 2mm circular magnets for the couplers.