Bowser Manufacturing Co.
Part

Operating Trolley Roof Pole
Walthers Part # 6-1250
HO scale, $13.95, not currently in stock at Walthers, Expected: Unknown

 
Bowser easy-to-build kits feature plastic molded bodies, underframes, brake platforms, brake wheels, coal loads (where appropriate), free-rolling trucks, nonmagnetic wheels, x2f couplers. Other features include authentic painting and printing, and coupler pockets that accept Kadee #5 couplers.