Normals do sometimes have very thick heavy pied markers. I have one right now that I am sure is not het for anything because I produced it. The only way you can somewhat rely on the railroad tracks is if you are sure of the parents genes. Any morph can have an orange and white ringer. Some are more prone to it but it doesn't mean they are het pied. I have a cinnamon and a yellow belly and a fire all with partial ringers. Not het for anything.

The small white spot you showed is common on normals and some other morphs as well.