Add Signal Cab to iOS throttle software list

Adds Signal Cab (https://signalcab.com) as a new iOS DCC controller app.
Includes a full documentation page with features, protocol support, and
requirements sourced from the Signal Cab website.

- docs/throttles/software/signal-cab.rst (new page)
- docs/_static/images/throttles/signal_cab_logo.png (app icon)
- docs/throttles/software/index.rst (added to iOS list and toctree)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Wemps

docs/_static/images/throttles/signal_cab_logo.png

@@ -39,6 +39,7 @@ Apple iOS (Phones and Tablets)
 - :doc:`DCC-EX CAB (iOS and Android) <dccex-cab>`
 - :doc:`WiThrottle Cab (iOS and Android) <withrottle-cab>`
 - :doc:`WiThrottle (iOS)<withrottle>`
+- :doc:`Signal Cab (iOS) <signal-cab>`
 
 Personal Computers
 ------------------
@@ -74,6 +75,7 @@ Note: The Android throttle apps listed above can be made to made to run on Windo
     TrainNavigator (iOS) <trainnavigator>
     Train Throttle (Windows, Mac, iOS) <train-throttle>
     WiThrottle (iOS) <withrottle>
+    Signal Cab (iOS) <signal-cab>
     DCC Commander (iOS) <dcc-commander>
     Android Apps on Windows <android-apps-on-windows>
 

docs/throttles/software/index.rst

@@ -0,0 +1,82 @@
+.. include:: /include/include.rst
+.. include:: /include/include-l2.rst
+.. include:: /include/include-throttles.rst
+**********
+Signal Cab
+**********
+
+|conductor| |tinkerer| |engineer|
+
+.. image:: /_static/images/throttles/signal_cab_logo.png
+   :alt: Signal Cab Logo
+   :scale: 30%
+   :align: left
+
+`Signal Cab <https://signalcab.com>`_ |EXTERNAL-LINK| is a modern DCC controller for iPhone and iPad, built by model railroaders for model railroaders. It combines precision locomotive control with a clean, intuitive interface — manage your fleet, run consists, program decoders, and control track power, all from your iOS device.
+
+Please visit their website: https://signalcab.com |EXTERNAL-LINK|
+
+.. _signal-cab-features:
+
+Features
+=========
+
+**Throttle & Control**
+
+* Multi-throttle support — control multiple locomotives with a swipeable carousel; quick-switch between active locos without missing a beat
+* Full 128 speed step resolution for smooth, precise control
+* One-tap Emergency Stop (E-Stop)
+* Configurable E-Stop behavior and track power management (main and programming track)
+
+**Locomotive Library**
+
+* Full roster management with search, favorites, and group organization
+* Supports short DCC addresses (1–127) and long DCC addresses (128–10293)
+* Import locomotive rosters from |EX-CS| and |JMRI|; DigiTrains Pro import coming soon
+* DCC address conflict detection — prevents two locomotives sharing the same address from entering service simultaneously
+
+**Function Control**
+
+* Full F0–F28 function support with both momentary and latching modes
+* Built-in decoder defaults for SoundTraxx, Digitrax, and NMRA standards
+* Fully customizable function labels, icons, and colors
+
+**Consist Control**
+
+* Build virtual and advanced consists
+* Per-member direction control and speed trim
+* Automated decoder programming for consist members
+
+**CV Programming** *(Beta)*
+
+* Read and write configuration variables (CVs) directly on the programming track — no separate programmer or computer required
+* Visual speed curve editor supporting CV2–6 and full 28-point speed tables
+* Fine-tune acceleration, deceleration, and trim to match your prototype
+
+**Connectivity**
+
+* Automatic command station discovery via mDNS — no IP addresses to enter; Signal Cab finds your station on the local network automatically
+* Auto-reconnect with exponential backoff and a configurable resume window (10–60 minutes)
+* Connects via WiFi
+
+**Protocol Support**
+
+* |DCC-EX Native Commands| — stable; connects directly to |EX-CS| with full command set including programming, turnouts, and diagnostics
+* |WiThrottle Protocol| — beta; connects directly to |EX-CS| or via |JMRI| and other WiThrottle-compatible command stations
+* Z21 / SRCP — planned for a future release
+
+**Apple Platform Integration**
+
+* Siri commands, App Shortcuts, and Spotlight integration — trigger actions hands-free
+* Customizable iPhone Action Button support
+* Tactile haptic feedback on the throttle
+* Designed for iPhone and iPad
+
+.. _signal-cab-requirements:
+
+Requirements
+=============
+
+* An |EX-CS| with WiFi enabled
+* An iOS device (iPhone or iPad) running iOS 15 or later
+* WiFi connectivity — see :doc:`Wifi Setup </ex-commandstation/diy/wifi-setup>`