So for me a Hybrid comes down to what the type of track system is made of. If its a steel type variety then I consider those a steel track roller coaster. If they are a solid wooden floating track then I call them a wooden roller coaster. For me I call all RMC track coasters steel track coasters due to the way that the steel parts of the track are connected and attached to the structure. For structures its simple, metal supports of any variety are a steel supported roller coaster. Wood of any variety is a wooden supported roller coaster. So any combination of steel supports and steel track is considered a steel roller coaster. Steel supports and wooden track or wooden supports and steel track is considered a hybrid roller coaster. Wooden supports and a wooden track system I consider a wooden roller coaster.