Chapman Siding, view of FMG's Zhuzhou Rolling Stock Works built waggons showing the 'F' type fixed and rotary couplers between 'control' waggon 2396 and 'slave' waggon 1187. Note the difference in the tare weights, 2396 with the fixed coupler is the 'control' waggon, while 1187 is the 'slave' waggon with the rotary coupler. The yellow circle also denotes the rotary coupler end. 16th January 2008.