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.These improved overflow loops are useful at the entrance of a busystation, where you need to prevent traffic backup into the main line.(a)In ------------------------>-\--.->-/ 15 | | 6| || 7 7 |`-->------>-'(b)Here, (a) is the usual way to the station, and it's used if there'sno train waiting.Make sure that your longest train will fit entirelyon (a) to make this work.If there is already a train waiting, othertrains will take route (b) and line up at signal 6.You can make (b)as long as you like.It should have a few one-way signals 7 along theway to allow several trains to line up.A few important points:* Signal 1 is the pre-signal leading into the station* Signals 5 have to be two-way, or all trains will want to use route(a)* Route (b) can either cut into route (a) before signal 1, or leaddirectly into the station.I recommend the above setup(connecting before signal 1) because that way all trains willuse the overflow if it is in use.Otherwise trains will be ableto take the shortcut even though they should line up at the endof route (b).* Signal 6 has to be a one-way signal, as does signal 1.* If you put a one-way signal before signal 5, it will be apre-signalThis has a few advantages over a regular overflow loop.First, thetrains only have to use it once before lining up at signal 6 and don'tcontinue to loop until a platform is available.Also, even if thestation is full, at least one more train will not have to use it, onlyif two or more trains are waiting will it be used.Third, one of thewaiting trains will enter the station as soon as a platform is free,without having to complete a loop because it already is waiting at thestation entrance.And lastly, the trains will be served in the orderthat they arrive in.In an overflow loop, there is no guarantee that atrain will not loop indefinitely at a very busy station, just becausenewly arriving trains steal into the platforms.4.2.3.4 Example savegame.Many aspects of pre-signalling can be confusing to those new to it.To help with the understanding, I have created a demonstration with asmall savegame that you can download(http://publish.uwo.ca/~jdrexler/ttdpatch/presig.zip).Please makesure that it won't overwrite one of your savegames.The save file is`trt56.sv1', so if you already have that file, make a copy of it.Itfeatures both a through station and a terminus station, and has twoimproved overflow loops.I encourage you to test this savegame with the pre-signal switchdisabled, too, so you can see the difference it makes, and trydifferent numbers of trains (as low as 7 maybe) by sending them to thedepot, and more or fewer platforms at both stations.4.3 Frequently Asked Questions==============================How do I run TTD/TTDPatch on Windows NT/2000/XP?Please read section 3.33How do I make a configuration file?Since TTDPatch version 1.8, a default configuration file iscreated if you run TTDPatch without any options and no`ttdpatch.cfg' file exists.Then you can simply edit this fileand set the options as you like.Other ways of making a configuration file:* Get the configuration tool from the TTDPatch website, choosethe switches you want, and then save it as `ttdpatch.cfg'.* Have TTDPatch make one for you.In a DOS command line, enterthe following.For the DOS version:ttdpatch -a -W ttdpatch.cfgFor the Windows version:ttdpatchw -a -W ttdpatch.cfgThis will also run TTDPatch with the new configuration, sothat you can test whether it works.How do I change the configuration?If you already have a configuration file (if not, see above), youcan simply edit it in any text editor.In Windows, run Notepad andopen `ttdpatch.cfg' in your TTD directory.In DOS, run Edit and dothe same.Then simply change what you like, and save the fileagain
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