The Walschaerts valve gear is a type of valve gear used to regulate the flow of steam to the pistons in steam locomotives, invented by Belgian railway engineer Egide Walschaerts in 1844.The gear is sometimes named without the final "s",since it was incorrectly patented under that name. It was extensively used in steam locomotives from the late 19th century until the end of the steam era. [Wikipedia]

This set can be used for arrangement up to four coupled driver axles, each 17mm apart. The connecting rod connects to the wheel on the third axle. 

Product contents and assembly

Kit contains one pair of nickel silver etched valve gear, aluminium rivets and valve stem. Tools needed for assembly (not included):

• Side cutter to cut out the etched parts;
• Modeler hammer and envil or combination pliers to fasten rivets;
• Soldering iron with flux and filler to fix the stems;
• 1mm drill or needle file to adjust the rivet holes in the etched parts.