What is Glide Ice PBI G2 described as in the turnout's construction?

• A. An insulating foam
• B. A moisture barrier lamina
• C. A reflective coating
• D. A surface material for the thermal layer

Answer: (D)

The main concept here is understanding where Glide Ice PBI G2 fits in the turnout’s layered structure. This material is described as the surface material for the thermal layer, meaning it sits on top of the insulated core and under the outer shell. Its job is to provide a durable, smooth, and protective skin for the thermal layer, helping the insulation perform well and resist wear, rather than adding bulk insulation, blocking moisture, or reflecting heat. It’s not insulating foam, not a moisture barrier lamina, and not a reflective coating. So, identifying it as the surface material for the thermal layer matches its role in the assembly.