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I think I understand the basic concept of TWC, but some of the details continue to elude me. Even professional railroaders have been unable to answer my questions (perhaps I am just dense). My basic problem is this: <br />TW#1 Eng123 run from A to C. <br />How this Eng123 get past C without stopping first ? All the examples I've seen show a TW#2 that looks like this: <br />TW#1 is void (or complete) <br />Eng123 run from C to D. <br />The trouble is that TW#2 goes into effect as soon as it issued (and acknowledged etc.) so if it is issued before Eng123 gets to C, Eng123 has lost it's right to be on A -> C main track. If you wait until Eng123 is at C before issuing TW#2, Eng123 has to stop (unless C has a really loooong siding). <br />One option, of course is to omit the words "TW#1 is void" from TW#2, but it is my understanding that failsafe procedures prevent the issuance of a TW from C to A (if not also from A to C) unless TW#1 is void/complete. <br />The only solution I can thin of is to "cascade:" TW3# would void TW#1, not TW#2. But I have never seen that suggested anywhere. <br />Anyone know the answer to this conundrum <br />Will Tajibnapis
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