The Squealer is a true
motion-detecting flange squeal system. Using professionally recorded and
edited flange squeal, The Squealer brings authentic trackside sound
of steel wheels against rails for ultimate realism. The system uses a micro
motion detector between the ties to sense train movements and play either
the built-in professional sounds or user-defined sounds for maximum
flexibility. Modelers now have the ability to recreate all the trackside
audio ambience that has been missing from our model worlds.