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diff --git a/game/server/tf2/tf_walker_base.h b/game/server/tf2/tf_walker_base.h
new file mode 100644
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+++ b/game/server/tf2/tf_walker_base.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================//
+
+#ifndef TF_WALKER_BASE_H
+#define TF_WALKER_BASE_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+#include "basetfvehicle.h"
+
+
+class CWalkerBase : public CBaseTFVehicle
+{
+public:
+	DECLARE_CLASS( CWalkerBase, CBaseTFVehicle );
+	DECLARE_SERVERCLASS();
+
+
+public:
+	CWalkerBase();
+
+	// Derived classes must call this from inside their Spawn() function. Their Spawn() function
+	// should NOT chain down to CWalkerBase.
+	void SpawnWalker(
+		const char *pModelName,
+		int objectType,
+		const Vector &vPlacementMins,
+		const Vector &vPlacementMaxs,
+		int iHealth,
+		int nMaxPassengers,
+		float flPlaybackSpeedBoost	// Strider likes the animations played at 2x speed.
+		);
+
+	virtual void AdjustInitialBuildAngles();
+
+	// When it's in walk mode, it'll set a walk animation, process user input, set pose parameters,
+	// and move the entity around as it walks.
+	void EnableWalkMode( bool bEnable );
+
+	// This is called each frame to do thinking. Derived classes can hook this to do their own stuff each frame.
+	virtual void WalkerThink();
+
+	// Returns the new local origin to set based on the walker's movement.
+	// This usually just asks for the movement from the animation, but some walkers may 
+	// want to generate the motion in code.
+	virtual Vector GetWalkerLocalMovement();
+
+	// See notes on m_vSteerVelocity below.
+	const Vector2D& GetSteerVelocity() const;
+
+	void	WalkerActivate( void );
+
+	// See m_flVelocityDecayRate.
+	void SetVelocityDecayRate( float flDecayRate );
+
+	// Walkers think 10x/second.
+	float GetTimeDelta() const;
+
+// CBaseEntity.
+public:
+	virtual void Spawn();
+	virtual void Activate();
+
+// IVehicle overrides.
+public:
+	virtual void SetupMove( CBasePlayer *player, CUserCmd *ucmd, IMoveHelper *pHelper, CMoveData *move );
+
+
+// IServerVehicle overrides.
+public:
+	virtual bool IsPassengerVisible( int nRole );
+
+
+// CBaseObject overrides.
+public:
+	virtual bool StartBuilding( CBaseEntity *pBuilder );
+
+
+public:
+
+	// This is a hack to prevent the strider from playing a lot of footstep sounds, until we figure out 9-way anim events
+	float m_flDontMakeSoundsUntil; 
+
+	// Last usercmd buttons.
+	int m_LastButtons;
+	QAngle m_vLastCmdViewAngles;
+
+
+private:
+
+	// This is the (local) velocity that the player's controls are saying the player wants to move in.
+	// Note that it is completely virtual - the speed that the walker moves at is gotten from the animations ground speed.
+	// It maps this velocity a 9-way blend for movement. +X = forward, +Y = left.
+	Vector2D m_vSteerVelocity;
+
+	// Which pose parameters we use to make this guy walk around on X and Y.
+	int m_iMovePoseParamX;
+	int m_iMovePoseParamY;
+
+	float m_flPlaybackSpeedBoost;
+
+	bool m_bWalkMode;
+
+	// This is a magic number that can be tweaked to make the velocity decay faster.
+	// Default: 80
+	float m_flVelocityDecayRate;
+};
+
+
+#endif // TF_WALKER_BASE_H