For signals placed at a large distance (say, more than 1 kilometre) from the main signal box, semaphore arms were eventually driven by electric motor drives instead of cables or rodding. The application of an electric drive (and electric lights) would eliminate the need for a small signal box near each signal along the line. This zip-file contains non-functional items, to be placed against simple signal posts that do not already have a drive. Two assets are just simple boxes for either the front or rear of the post and suitable for one semaphore, the third asset is a larger box such as could be found on posts with two or three arms.
These items are trackside helper assets, visible only in Surveyor. The state and hence the aspect of a given signal depends on the situation on the line ahead. With one or more of these 'modifiers' placed beyond the signal at hand, the signal aspect can be altered. The mechanism behind this is copied from the 'feather' system of directional signalling introduced by author 'bloodnok' for Auran with his VSRSemaphoreSignal script. These modifiers are intended for use in combination with the 'feathers'. Since the 'next signal' as well as a 'feather' will end a forward track search, the modifiers should be placed between the signal at hand and either the next signal or a 'feather'.
With this menu-driven (? in Surveyor) asset, speed panels of various types can be placed on signal posts and signal brackets. On these posts and brackets, one of several positions can be chosen. The asset uses one of the libraries that can be found in another folder on this site. This asset does not set the speed for trains running on Trainz AI. For that to happen, one has to use invisible speed signs. The speed signs attached to bracket signals (branching signals) take effect only at the next junction, so the invisible speed signs for AI should be placed on the branches just beyond the junction point.
Information about the proper application of speed signs can be found in Signal Rule books of the Belgian Railways. Many documents (mostly in French, some in Dutch) have been collected on this invaluable website:
Service telephone boxes are usually found near signals. This set contains boxes at 1m height, one as a freely movable scenery item (to be placed against a post, for instance), one on a pole (freely movable), and one on a pole as a trackside item.