I just finished my signal guide for Long Island Rail Road! If you want a better understanding of how LIRR signals function, I highly recommend giving it a watch! The topics covered include: signal terminology, an overview of the Aspect Display Unit, detailed descriptions of each signal aspect, code change points, signal progressions, as well as a few operating rules. Enjoy! Please reach out if you have any questions. If you're a developer that will be utilizing the LIRR signals, please check out my guide on how to place and program signals in your route. Guide: Placing And Programming Signals For Long Island Rail Road | Dovetail Games Forums