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NEM bar couplers, originally designed for use with the Dapol mark 3 coaches to provide fixed coupling in HST and WSMR rakes.
These are designed and tested with Dapol and Bachmann Farish products. There is some variation in print size from Shapeways and NEM couplers are on the limit. so you may need to file down the top of the coupling bars fractionally in some cases).
I'm told these don't work with some of the continental pockets due to the subtle size variation between vendors.