Good catch. Depth is 1/8 in. The angle accuracy won't be super critical as these are for toy train tracks. The slight taper lets the wheels have some freedom to adjust other forces and stay in.You don't list a depth of cut for the groove or an angle so the depth can be calculated. It might also help to know what the groove is for.
That was what I was thinking I thought I saw wooden train track bit sets somewhere. https://www.mlcswoodworking.com/shopsite_sc/store/html/smarthtml/pages/bt_bull.html
Off the top of my head the only way that I can think of is to run a 5/32" bit followed by a 30° bit like the one shown.
That is assuming the angle is 30°