diff --git a/src/tools/SteamTrainApp.php b/src/tools/SteamTrainApp.php
index a5fb681..20725a1 100644
--- a/src/tools/SteamTrainApp.php
+++ b/src/tools/SteamTrainApp.php
@@ -11,7 +11,6 @@ class SteamTrainApp extends Application {
   const USE_LOGFILE = true;
   const USE_RUNFILE = true;
   const USE_RUNLOCK = true;
-  const USE_SIGNAL_HANDLER = true;
 
   const ARGS = [
     "purpose" => self::TITLE,
@@ -22,14 +21,17 @@ EOT,
     ["-c", "--count", "args" => 1,
       "help" => "spécifier le nombre d'étapes",
     ],
-    ["-s", "--use-signal-handler", "value" => true,
+    ["-s", "--install-signal-handler", "value" => true,
       "help" => "installer un gestionnaire de signaux",
     ],
   ];
 
   protected $count = 100;
 
+  protected bool $installSignalHandler = false;
+
   function main() {
+    if ($this->installSignalHandler) app2::install_signal_handler();
     $count = intval($this->count);
     app2::action("Running train...", $count);
     for ($i = 1; $i <= $count; $i++) {
diff --git a/wip/app/cli/Application.php b/wip/app/cli/Application.php
index 2a875e0..6851ef7 100644
--- a/wip/app/cli/Application.php
+++ b/wip/app/cli/Application.php
@@ -80,7 +80,7 @@ abstract class Application {
   const USE_RUNLOCK = false;
 
   /** @var bool faut-il installer le gestionnaire de signaux? */
-  const USE_SIGNAL_HANDLER = false;
+  const INSTALL_SIGNAL_HANDLER = false;
 
   static function _manage_runfile(int $argc, array $argv, RunFile $runfile): void {
     if ($argc <= 1 || $argv[1] !== "//") return;
@@ -125,7 +125,7 @@ abstract class Application {
       }
     };
     register_shutdown_function($shutdown);
-    app2::install_signal_handler(static::USE_SIGNAL_HANDLER);
+    app2::install_signal_handler(static::INSTALL_SIGNAL_HANDLER);
     try {
       static::_initialize_app();
       $useRunfile = static::USE_RUNFILE;