The utility model relates to a rail attachment rail clay fills car, its characterized in that: including the frame, the universal vehicle wheel of installation frame bottom installs the track clay storage storehouse on the frame, the front end in track clay storage storehouse is equipped with the clay honeycomb duct, install the control valve on the clay honeycomb duct, hopper arrangement is filled in the discharge end connection of clay honeycomb duct, fill hopper arrangement and connect the frame through adjustable link, be equipped with adjustable stop device in the bilateral symmetry of filling hopper arrangement, stop device hugs closely track inslot lateral wall. Adopt above -mentioned technical scheme, this equipment does not need any machinery to drive, promotes lightly, and pouring speed is very fast, and every section track clay fills and only needs 10 minutes, and efficiency has had very big improvement. A large amount of manpowers has been saved to this equipment, has effectively reduced work operation intensity, and the efficiency of construction is fast to easy operation is nimble, fills accurately, has avoided the manpower to fill and has caused, moreover the cost is reduced.