The coupling connection between GNER Class 91 electric locomotive 91115 Holyrood and the first Mark 4 carriage in the Intercity 225 consist. I think the main load-bearing connection is beneath the long metal plates, which I'm guessing provide the electrical connectivity.
Photographed between services at the eastern end of platform 8 of Leeds station.

Photo by Chris McKenna26/02/2006.
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