244 NO. 6 ET LOCOMOTIVE BRAKE 



besides providing new features necessary to meet the require- 

 ments of prevailing conditions of road service. This new 

 brake system is known as the ET locomotive-brake equip- 

 ment, the letters ET being an abbreviation for engine and 

 tender. 



The ET locomotive brake equipment is adapted for all 

 classes of engines and for all kinds of service, the only differ- 

 ence in the equipment for locomotives of different size or for 

 different service being in the size of the brake cylinders used. 

 It was introduced in 1905, and was known as the No. 5 ET 

 equipment. The No. 6 ET equipment is an improvement 

 on the No. 5 ET equipment, as it accomplishes in a simpler 

 manner all that the No. 5 ET equipment does, besides intro- 

 ducing other features that experience with the No. 5 ET equip- 

 ment has suggested. 



The ET brake equipment differs materially from the older 

 form of locomotive brake equipment. It consists of less appa- 

 ratus, as many of the valves are replaced by others of different 

 construction, and the method of its operation is somewhat 

 different. The same air pump, main reservoirs, duplex gauge, 

 and brake cylinders, together with their apparatus for carrying 

 the power to the brake shoes, are left in service, but the older 

 forms of automatic brake valve, slide-valve, feed-valve, and 

 duplex governor are replaced by new ones; also, the independ- 

 ent brake valve takes the place of the older form of straight- 

 air brake valve. 



The distributing valve replaces the triple valves, auxiliary 

 reservoirs, and high-speed reducing valves formerly used on 

 the engine and tender, and a new form of slide-valve feed-valve 

 fitted with the regulating device adapted for a quick change 

 of pressures takes the place of the reversing cock and duplex 

 feed-valve. The reducing valve for the independent brake- 

 valve also acts as a reducing valve for the air-signal system so 

 that the style of reducing valve formerly used with the signal 

 system is dispensed with. The double check-valves used with 

 the combined automatic and straight-air brake are also dis- 

 pensed with in the ET equipment. 



This new type of locomotive brake equipment can be 

 applied to any locomotive, whether used in high-speed or 



