4 files changed, 8 insertions, 8 deletions
diff --git a/game/activity.h b/game/activity.h
index f7eda21..f6ec609 100644
--- a/game/activity.h
+++ b/game/activity.h
@@ -13,7 +13,7 @@ public:
 	DEFAULT_MOVE_COPY(Activity);
 	virtual ~Activity() = default;
 
-	virtual void apply(Vehicle *, TickDuration) const = 0;
+	virtual void apply(Vehicle *, TickDuration) = 0;
 
 	template<typename T> class Of;
 };
@@ -22,7 +22,7 @@ using ActivityPtr = std::unique_ptr<Activity>;
 template<typename T> concept ActivityConcept = std::is_base_of_v<Activity, T>;
 template<ActivityConcept AC> class Can {
 public:
-	virtual void doActivity(const AC *, TickDuration) = 0;
+	virtual void doActivity(AC *, TickDuration) = 0;
 };
 
 #endif
diff --git a/game/activityOf.h b/game/activityOf.h
index a26efd1..c245866 100644
--- a/game/activityOf.h
+++ b/game/activityOf.h
@@ -6,10 +6,10 @@
 
 template<typename T> class Activity::Of : public Activity {
 	void
-	apply(Vehicle * v, TickDuration dur) const override
+	apply(Vehicle * v, TickDuration dur) override
 	{
 		if (auto tv = dynamic_cast<Can<T> *>(v)) {
-			tv->doActivity(static_cast<const T *>(this), dur);
+			tv->doActivity(static_cast<T *>(this), dur);
 		}
 	}
 };
diff --git a/game/vehicles/train.cpp b/game/vehicles/train.cpp
index f887be4..874db46 100644
--- a/game/vehicles/train.cpp
+++ b/game/vehicles/train.cpp
@@ -33,7 +33,7 @@ Train::tick(TickDuration dur)
 }
 
 void
-Train::doActivity(const Go *, TickDuration dur)
+Train::doActivity(Go *, TickDuration dur)
 {
 	const auto maxSpeed = objects.front()->rvClass->maxSpeed;
 	if (speed != maxSpeed) {
@@ -42,7 +42,7 @@ Train::doActivity(const Go *, TickDuration dur)
 }
 
 void
-Train::doActivity(const Idle *, TickDuration dur)
+Train::doActivity(Idle *, TickDuration dur)
 {
 	if (speed != 0.F) {
 		speed -= std::min(speed, 30.F * dur.count());
diff --git a/game/vehicles/train.h b/game/vehicles/train.h
index fb94102..e3dad73 100644
--- a/game/vehicles/train.h
+++ b/game/vehicles/train.h
@@ -28,8 +28,8 @@ public:
 	void render(const Shader & shader) const override;
 
 	void tick(TickDuration elapsed) override;
-	void doActivity(const Go *, TickDuration) override;
-	void doActivity(const Idle *, TickDuration) override;
+	void doActivity(Go *, TickDuration) override;
+	void doActivity(Idle *, TickDuration) override;
 
 	[[nodiscard]] Location getBogiePosition(float linkDist, float dist) const;
 };