Hi Jim,

I see there is an article on using smart phone for a throttle. 
    Actually we did this at Ring Engineering about 15 years ago when the
    first Pocket PC's came out.  However, we never sold the products to
    control trains because we believed it was not a good solution for
    the majority of model railroaders.  Below is from our RailPro
    frequently asked questions that describes why we choose to build our
    own hardware for RailPro instead of just developing software for off
    the shelf products.

Is using a tablet or touchscreen phone with a train control App like
    using RailPro?
 No.  Not at all. We started our development with an off the shelf
    generic touchscreen handheld computer.  Shortly afterward we
    realized that was completely the wrong direction and would never
    make a good product for the user. What we realized was that we
    needed to develop a handheld controller from scratch with the goal
    of controlling your model train layout. Some problems with the off
    the shelf touchscreen computer that we encountered included:
1) We found that using a touchscreen for a throttle was
    unacceptable.  The problem is that you needed to be looking at the
    screen to adjust the speed accurately and the feel was poor at
    best.  You need to be looking at the train engine to properly
    connect couplers etc.  This is why we included a real knob on the
    RailPro controller.  So you can have your hand on the speed control
    knob and still be looking at your train.  What is the point in
    having a controlling device that is not actually a good throttle? 
2) The developers of the phones and tablets change their products
    quickly and it is unreasonable to think that they will ask the
    opinion of model railroaders when they develop new equipment because
    this is not the market that they target.  Therefore if you want a
    throttle just a couple years from now, you have no idea what you
    will be able to get or if it will even be compatible.  With RailPro
    we control the hardware and a top concern of ours is long term
    availability and comparability with a RailPro system. Further, it is
    also unreasonable to think that the software developers will get any
    advanced notice of hardware changes or even complete operating
    system charges!  Therefore, after a couple of years, the software
    developers will be always be trying to catch up with whatever new
    device is being sold. We believe this alone can stop any company
    developing for modeling because of the inability to keep up with
    constantly changing hardware. With RailPro, our hardware will never
    change without our knowledge and our software development will not
    be hampered by constantly changing hardware without notice.
3) We had problems where other apps would pop up or interrupt the
    train app and the train app would be inaccessible or would cause
    communication problems.  If the app becomes inaccessible you cannot
    stop your trains!   This does not happen with RailPro because there
    are no other apps to interfere. 
4) Typical consumer computer networks are not guaranteed real time. 
    The response time can be anywhere from good to no control at all.
    With RailPro, at least 40 simultaneous users will have guaranteed
    fast response and hundreds of handhelds are likely to work very
    well. 
5) Product instability is a problem with off the shelf computers. 
    The odds of you buying the same product only a year later is
    unlikely.  So it may be necessary to support different software
    programs, different OS's, different networks etc.  
6) Network setup with RailPro is as simple as pressing the Find
    Product button.  Any PC network we have ever dealt with is far more
    complicated and problematic.
7) Nobody wants to wait until their PC's booted and make a wireless
    connection just to drive a train.  With RailPro the handheld is
    ready to control trains in about one second.  Who would want typical
    PCs problems involved in operating their train set like software
    crashes, reboots, hard drive failures etc.?
8) With RailPro you do not need a PC down by your layout.  You do
    not need to buy a PC just for your layout.  
9) Don't you think that buying products from many manufacturers,
    instead of just one, is much more likely to have problems?  Also, if
    you have a problem don't you think that it will be more difficult to
    fix?  For example, if you get a touch control product from
    manufacturer A, software program for the touch control product from
    programmer B, PC from manufacturer C, wireless network product from
    manufacturer D, PC to train control system interface product form
    manufacturer E, software for the PC to train control system from
    programmer F, and the train control equipment from manufacturer
    G....then who is going to be responsibly for fixing a problem with a
    system like this??? 
Ring Engineering's RailPro system has color touchscreen controllers,
    outstanding software, and a complete easy to use system available
    from one source.  Further, it is available today!
10) Battery life was too short.  Our Handheld controller can run up
    to 12 hours* on a single charge for all day model railroad fun.
Therefore, what we learned is that you need proper hardware and
    software to make a better train control system.  It takes years of
    software development to obtain a well written, dependable, and easy
    to use interface like RailPro has. Because of the high level of
    technology in our controller it took years to develop the handheld
    controller.  Further we tested it for years to be sure it worked
    very well before it was sold.  RailPro has been in development for
    nearly a decade and we are confident that it shows in our RailPro
    product. Because RailPro's base hardware and software have been
    completed, future products can be developed much more quickly and
    easily.
11) Our handheld is designed to be held all day so you can follow
    the action around.  In our opinion holding a tablet all day to run a
    train is unacceptable.

posted by Jim Sleeth Now I have to use DDC to. Not easy to be in S.

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