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NXSYS

NXSYS, New York City Subway Signalling and Interlocking Simulator for Microsoft Windows®

A tool and toy and labor of love by Bernard S. Greenberg(contact Bernard).

NXSYS is an application for modern versions of Microsoft®Windows® (and now Macintosh Mac OS X - see below)that recreates for you the experience of controllingswitches, signals, and trains in the New York City Subwaysystem. Rather than conventional menus and toolbars, NXSYSpresents to you the exact same user interface as so-called'Entrance-Exit' 'pushbutton interlockings' present to New York Citysubway towerpersons, except that instead of pressing buttons with yourfinger, you click with the mouse. And instead of commanding realtrains full of people, NXSYS simulates them cybernetically. Yousee the same display, get the same options and responses, must learnthe same skills, and may enjoy the same pleasures as a towerperson atan 'entrance-exit' interlocking.

There is no more comprehensive, detailed information source on NewYork Subway Signalling publicly available, or perhaps even toinsiders. This is THE way to learn about New York City Subwaysignalling. And it's for free, fun, interactive, extensible, andassumes no prior knowledge. (If you wish to learn about NYCity signalling right now on the web, and aren't interested in tryingNXSYS, or don't have a Windows® machine, please visitNYC Subway Signals, written by the author of this program and its documentation.)

The trains and tracks are imaginary, but the control panel, theextensive relay logic circuitry, and the real-time behavior andinteraction of you and the imaginary trains and tracks are not. Youpress buttons and establish and cancel routings, control signals andswitches, and interact with moving trains. You are limited by thecircuitry to safe moves -- you are prevented from sending trainscrashing at each other, setting routes that conflict with each other,moving switches while trains are on them, or executing any otherinvalid or dangerous action. Learning to control the switches andsignals under these constraints is by no means trivial, and this iswherein the fun of NXSYS lies. NXSYS is supplied withtwo sample interlockings, a (fairly complex) 4-track layout, and afull-spec detailed three-track layout, an automatic demo that showsyou what to do and comments on it, and a comprehensive help file instandard Windows® hypertext help format that explains not only allthe functions of the program and supplied interlockings, but all ofthe railroad signalling, switching, and New York-specific conceptsinvolved.

NXSYS actually simulates relay wiring and logic designedaccording to New York City Transit Authority models and standards thathave changed little in forty years. For theelectrically-inclined, NXSYS allows the actual relay circuitsto be shown in standard NYCTA notation, printed out enmasse to a system printer, and actually observedin operation! Information is available for designing your ownlayouts. Not insignificantly, NXSYS can also be used as apowerful tool for interactive relay-logic design and simulation.

A lifelike three-dimensional 'flight simulator' view, showing theinterlocking as you operate it, as a train operator would see it, isavailable. NXSYS is also an OLE Automation Server, andcan be scripted by OLE Automation clients such as Microsoft VisualBasic®, or its own supplied client.

If you find what you think are bugs, or even if you don't, pleasecheck this page and the release notes (see Downloads). Donot hesitate tocontact the developerif you think you've identified a new bug.

NXSYS can be viewed, utilized, or enjoyed at any of four levels:

• An entertaining rapid-transit video game for those who love the subways and wish to recreate the experience of navigating the tracks, and learn more about the subways and their signals.
• A comprehensive, interactive learning tool for the operation of rapid transit signalling and NX/UR control towers sufficiently detailed and accurate to be of value to those actually responsible for operating such equipment.
• A detailed guide to the sample implementation of such systems in electrical relay logic, observable in action down to the relay level.
• An interactive computer-aided design (CAD) tool for designing and debugging your own interlockings and signal circuitry.

NXSYS OpenGL Cab View Feature (Windows Version)

NXSYS/OpenGL Screen Snapshot.

(OpenGL Cab View not available on Mac version).If you need the special Windows 95/98 DLL's (if you use WindowsNT(tm), you already have what you need) to run the 3-D Cab Viewsoftware please read the following:

NXSYS' 3-D track view feature exploits the massive power of theOpenGL Graphics interface developed by SiliconGraphics®, Inc. (in its implementation on 32-bit versions ofMicrosoft&reg 32-bit Windows) to display a 'virtual reality', flightsimulator-like window showing the tracks and signals of interlockingsas they actually appear to eye of the train operator (previously'motorman'), in full perspective with lighting, shading, etc. If yourmachine is fast enough, realistic animation is achievable.

This cab view window appears in addition to the interlockingcontrol panel, and, running semi-autonomously in a separate thread,has its own menu and keyboard commands. When you control the signalsin NXSYS via the standard means, the 'real signals' in the cabview window change aspect dynamically. You can move the viewpoint upand down the tracks and turn around. Self-documentation issupplied. Press F1 for documentation/help when in the Cab ViewWindow.

You can use the cab view window in conjuction with the 'train system',and actually see out the front window of a train as it moves over theinterlocking, as with a flight simulator.

In order to try it, you need three components:

• The NXSYS OpenGL DLL NXGLVIEW.DLL, which is distributed with the current version of NXSYS (see Downloads).
• The current version of NXSYS (see Downloads).
• The OpenGL system. If you are running Windows 2000,or Windows NT 3.51 or better, you already have OpenGL as partof the operating system. If you are running Windows '95, youmay or may not have the necessary components. If youhave OPENGL.DLL and GLU32.DLL already,great. If not, you can get them (Windows '95 only: they are MicrosoftRedistributables) at this link. Unzip them into NXSYS' directory, or your windows System directory.

If you have the OpenGL components available, and youplace NXGLVIEW.DLL where NXSYS can find it (for example,in the same directory), NXSYS will display the new window atthe time you load an interlocking. If you do not have the DLL, or failto place it where NXSYS can find it, or you are missingOpenGL, NXSYSwill not diagnose an error, but will proceedto operate as it had in the past, without them.

You need a reasonably fast processor for this to perform acceptably.Performance on a 90MHz Pentium(tm) is acceptable; performance on a33MHz 486 is unacceptable; floating point hardware is a must.Intermediate data points are not available yet. It should look likethe image above -- if it does not, please notifythe developer, and be sure to describe your video card, processor, and operating system.

NXGLVIEW.DLL and the NXSYS main app 'know about' theinsides of each other, so you must have compatible versions to use theformer. Thus, when NXSYS loads the DLL, they will negotiateand make a check that the versions you have are compatible, and ifthey are not, you will get a message to that effect advising you toobtain a pair which are. If that occurs, please fetch thelatest NXSYS and NXGLVIEW.DLL (see Downloads).

Download, Version 1 for Microsoft Windows

NXSYS requires a 32-bit version of the Microsoft Windows®operating system, meaning Windows 95®, Windows 98®, WindowsNT®, Windows 2000®, or Windows XP® on the Intel®architecture (386, 486, Pentium®, etc., i.e., any 'PC') only. Itis not supported on Win32s®. To download it, click below, andunzip in a new directory of your choosing, and be sure to readreadme.txt.

For those deeply enough involved with the concepts at hand to attemptto design their own scenarios (track layouts) in NXSYS' 'relaylanguage', which is a subset of Lisp, the 'relay compiler' (a 32-bitcommand line application) and its associated tools and documentationsuch as it is are available. Be forewarned, however, that to createyour own operative interlockings, you have to design and implement allthe relay circuitry -- the tools do not design the interlocking foryou.

For those NXSYS experts who are also Windows experts who wishto write OLE Automation Controllers for NXSYS, the OLE automationtools are useful and necessary. If you don't know what this means,you don't need it.

NXSYS for the Macintosh (Mac OS X)

At long last, here is a complete implementation of NXSYS, the New York City interlocking and signalling simulator, for the Apple Macintosh. NXSYS/Mac is a port of NXSYS Version 2, which, as you can see from the screenshot above, allows for unrestricted two-dimensional track and panel layouts (the Microsoft Windows release of NXSYS Version 2 is not ready yet). NXSYS/Mac is distributed with four sample interlockings: in addition to Version 2 ports of Progman St. and Islington from Version 1, full implementations of two actual fairly complex New York City interlockings, Atlantic Avenue on the IRT (Division A) and Broadway-Myrtle on the BMT (Division B) are supplied. Full HTML documentation of the new Macintosh features as well as a thorough upgrading of the extensive Version 1 helpfile are included.

Version 2 NXSYS (including NXSYS/Mac) does not support the OpenGL 'Cab View' feature of Version 1. NXSYS/Mac also does not support (Windows COM/OLE-based) NXScript. Otherwise, it's all there, including TLEdit, the Version 2 track layout editor (see the documentation inside).

Developed mainly under Mavericks (OS/X 10.9), NXSYS/Mac has been tested against Yosemite (OS/X 10.10), and continues to support Mavericks, but not earlier. NXSYS/Mac is distributed as a .dmg disk-image file system, in whose top directory you will find a README with further instructions.

Download, Version 2 for Mac OS X

Legal Disclaimer

Legal Disclaimer. If you want to use these ideas and softwaretools for your own model railroad, have fun, but please be aware thatthe design of safe, reliable signal circuitry for real railroads andother life-critical missions is a highly-skilled specialty requiringyears of training, apprenticeship, and certification. Any principlesgathered from the documentation and circuitry of this program, eventhough they often reflect standard practice, are not to be construedas a substitute for circuit design by certified persons andorganizations under legal contract. In specific, the author disavowsany responsibility for any harm, damage, or injury resulting from useof these circuits or schemes for any purpose whatsoever. Thesecircuits and documentation are provided for educational,demonstrative, and entertainment purposes only, and are not to be usedfor control of life-critical missions. What is more, if younonetheless attempt to use these circuits or schemes to construct andoffer for sale any device or system, you alone are responsible forensuring that no patents, copyrights, or other applicable rights arebeing violated thereby. Download of this software constitutesacceptance of these terms.

Microsoft, Windows, Windows 95, Windows 98 Windows NT, Windows 2000,Win32, Win32s, and Visual Basic, are a trademarks of theMicrosoft Corporation. Apple, Macintosh, Mac, and OS X are trademarks of Apple, Inc., registered in the US and other countries.Pentium and Intel are trademarks of the Intel Corporation.

'NX' refers to ascheme of railroad switch and signal control offered by GeneralRailway Signal, Inc. (a unit of SASIB Railway Group). Neither this software nor its documentation has beenauthorized, approved, or verified by them or any other railroad signalconcern or the New York City Transit Authority or its successors.

This software is offered without charge, 'as is', by the author,Bernard S. Greenberg. It is thought to be relatively bug-free, although bug reports will be fieldedusing this form, but no response in any given time promised. No representations,warranties, guarantees, or claims about operability or suitability forany purpose are made. This software is intended for educational,demonstrative, and entertainment purposes only, and is not suitablefor use for control of actual railroads or other life-criticalmissions. The author assumes no responsibility for any damage, harm,injury or loss resulting from use or misuse of either the software orthe relay circuit designs therein. The author assumes noresponsibility for errors resulting from corruption of thedistribution media or files or inadvertent or deliberate corruption intransmission. You may use and share this program as you wish, but arenot permitted to incorporate this program or its parts in anydistribution, collection, or commercial product without the consent ofthe author. If you redistribute it, you must redistribute the zipfilesas you received them, intact, with all their components asposted. Download of this data constitutes acceptance of theseterms.

This software is intended for personal use and personal education,and offered free of charge under those conditions. Business concernsand governmental organizations, rapid transit and engineering inparticular, seeking to use this software for other than entertainmentor personal education should contact the author at the address belowabout licensing arrangements and possible future development.

Copyright

NXSYS, NXSYS32, NXSYS for Macintosh, software, documentation, and interlockings Copyright ©1994-2001, 2014 Bernard S. Greenberg.

Page Credits

Descriptions and graphics on this page (unless otherwise noted) are Copyright © 1997-2002 Bernard S. Greenberg (contact).