This is a signal mechanism with integrated circuits for controlled stopping of digital locomotives with high-efficiency propulsion. This module has connections for a two-aspect color light signal, for the 3 necessary lengths of track for controlled stopping of a locomotive. The braking module is operated either with a k 83 decoder or with a 7272/72720 conventional control box. Dimensions 100 x 54 x 22 mm / 3-15/16" x 2-1/8" x 7/8".The braking module requires 3 electrically isolated lengths of track in the signal area. The first part is a transition area, which corresponds to the length of a ski-shaped pickup shoe (approx. 70-90 mm / 3"-4"). The second length of track is the actual braking area, in which the locomotive comes to a controlled stop. The length of the braking area is determined by the brake delay setting on the locomotive's decoder. This second length of track should be at least 40-50 cm / 16"-20". The third length of track is a safety section, in which the operating voltage is turned off as in standard signal blocks. This prevents the locomotive from "running through" the signal block unintentionally.The braking module can be used for color light and for semaphore signals.Locomotives with built-in digital or Delta electronic circuits without a control feature sometimes come to a stop in the braking section or even in the safety section. We cannot tell you exactly how each of these locomotives will behave. We therefore do not recommend using the 72442 braking module with locomotive decoders that do not have a control feature.