From 2531418d26f44c07a4b11e0362d3b73b3cb50941 Mon Sep 17 00:00:00 2001
From: maj00r <maj00r@host>
Date: Tue, 15 Sep 2026 00:03:42 +0200
Subject: [PATCH] Let a command cell reach a shut down driver

A dormant driver scans, but bailed out before anything could act on the
table. Signals stay out of it - only cm_Command is dispatched, so a memory
cell put in front of a parked consist can hand it Prepare_engine.
---
 vehicle/Driver.cpp | 12 ++++++++++++
 vehicle/Driver.h   |  1 +
 2 files changed, 13 insertions(+)

diff --git a/vehicle/Driver.cpp b/vehicle/Driver.cpp
index b68ac224..5388a739 100644
--- a/vehicle/Driver.cpp
+++ b/vehicle/Driver.cpp
@@ -7524,6 +7524,7 @@ TController::pick_optimal_speed( double const Range ) {
 
     // if we're idling bail out early
     if( false == is_active() ) {
+        check_cell_ahead();
         VelDesired = 0.0;
         VelNext = 0.0;
         AccDesired = std::min( AccDesired, EU07_AI_NOACCELERATION );
@@ -8550,6 +8551,17 @@ TController::check_route_ahead( double const Range ) {
     }
 }
 
+void
+TController::check_cell_ahead() {
+    // shut down, so no signal is acted upon; a command cell is the only way to reach us
+    if( false == AIControllFlag ) { return; }
+    if( ( OrderCurrentGet() & ~( Shunt | Loose_shunt | Obey_train | Bank ) ) != 0 ) { return; }
+    if( mvOccupied->Vel >= 0.1 ) { return; }
+    if( TableUpdate( VelDesired, ActualProximityDist, VelNext, AccDesired ) != TCommandType::cm_Command ) { return; }
+    if( eSignNext == nullptr ) { return; }
+    eSignNext->send_command( *this );
+}
+
 void
 TController::check_route_behind( double const Range ) {
 
diff --git a/vehicle/Driver.h b/vehicle/Driver.h
index 4943611e..679d5f50 100644
--- a/vehicle/Driver.h
+++ b/vehicle/Driver.h
@@ -387,6 +387,7 @@ private:
     void control_braking_force();
     void apply_independent_brake_only();
     void check_route_ahead( double const Range );
+    void check_cell_ahead(); // shut down driver: only a command cell can reach it
     // false when the permission at the nearest signal was given to another consist
     bool SignalPermissionIsOurs( bool const Signalgivesgo ) const;
     bool OtherConsistAtSignal() const; // another consist in front of the signal = the addressee of the permission