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