Today modelers create model railway layouts as a hobby, recreating real locations and periods throughout history. Railway modeling has become quite realistic concerning the details of the models and very authentic when it comes to the locations being recreated. Reed Switches are used in several areas to ensure the authenticity of the real world trains are met with regards to the changing of tracks, changing of lights, and to ensure level crossings are opened only after a train has passed. Reed Switches are placed under the tracks of model trains and each of the trains engines and last bogeys are fitted with one magnet. The signaling of the red and green lights or the opening of level crossings can now be controlled after a train has passed the signaling point and this almost certainly makes causes pleasing response from those viewing the model trains in action. These outputs which control the lights can also be given to reed relays to actually cut off power to a train when a red light is on. Latching sensors are also used at junctions to remember whether a train has passed or not.