Wooden Train Class 37 Locomotive

Here's a cartoon interpretation of a class 37 locomotive I've designed for my sons wooden railway tracks. There are two versions. One in which each bogie has three working axles and another which has two working axles and a smaller non-working middle axle. The three axle variant works fine but I found it can sometimes derail around the tighter curves so the dual axle version has a slightly smaller wheel base to get round tighter curves. There is the option to use 25mm 'eye hooks' on the dual axle version or a single pin in each bogey with interlocks in the underside of the chassis to stop them being able to spin 360 degrees. See the attached screenshot which shows how the pin interacts with the chassis. It doesn't need to be screwed all the way into the bogie. All the hardware is M3x12. Button heads are my preference but 2.9mm post head screws can be used too. The ring magnets are attached with M4x10 button head screws. I am looking at developing a multi material version in the not too distant future.