All products presented here have been carefully developed for their intended purpose. The materials used are deemed the best available resources for the desired outcome. Acrylic, in particular, is a resource that combines the high demands of a shiny surface finish combined with the desired manufacturing possibilities. When combining acrylic with brass (for the tracks), as is the case with the TRAIN-SAFE Vision and TRAIN-SAFE Roll tubes, a problem occurs because of the different expansion characteristics of the materials with temperature changes. This effect sometimes causes a minimal deformation of this extraordinarily slim piece but this is not in any way to be regarded a defect. It is a simple physical reaction that does not have any effect on the system’s very useful functions.