Constraint4: sSta1 will never be GREEN nor WHITE, only YELLOW or RED.ģ.2.3 Dynamic link between asEntSta & main signal of bSta2 (sSta2).Don't take into account the name of the signal associated to bExSta ( sUp2 was shown in § 3.1 only for understanding the behavior of the signals)ģ.2.2 Dynamic link between asEntSta & main signal of bSta1 (sSta1).Constraint2: sBySta will never be GREEN, only YELLOW or RED. The remaining requirements will differ only by the names of the blocks, the aspect number of next main signal, and possible new constraints.ģ.2.1 Dynamic link between asEntSta & main signal of bBySta (sBySta) The essential things have been stated in the previous paragraph. From a logical viewpoint, they are still valid. The requirements above (regarding the color propagated backwards) may thus seem wrong, but it is an implementation constraint. 20% of the goal to achieveĬonstraint1: In the real life, when considering an advanced signal located on the same mast as a main signal, if the main signal becomes RED then the advanced signal displays NOTHING (no lamp lit). The propagation of the color of sUp1 towards asEntSta, i.e.Operation of Rocrail with “reserve 2nd block feature” enabled, regarding the main signal colors, depending on the loco position.Standard operation of Rocrail regarding the block and route states, depending on the loco position. That means that the signal associated to the next reachable block after current block can be either green or yellow (and of course red if no block ahead is available or a forced stop is programmed), and as a result something different than red can be displayed on the advanced signal.įig 5 – Requirements: Description of colors of signals, depending on the loco position That means that, even if a block ahead is free for use or reserved, the signal located at the end of this block ahead will become green (or yellow), only when the block is being entered.īy default, such a behavior prevents a main & advanced signal on same mast to show the status of the next main signal (the next block is not yet entered), and as a result, the advanced signal will always be red or “blank” (and will never change, or will change “too late”).įortunately, a feature of Rocrail called “reserve 2nd next block” allows this behavior to be modified : the “closed block” logic always applies, but only at the 2nd next block. The logic associated to Rocrail is a “closed block” logic.
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