Although I'd love for it to be a pigeon poo recycling facility, it is actually a Fire training facility 

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MBIFO a viking ship in Cliffsend, Isle of Thanet, on today's ride.
Two of those little tractor units used by ferry companies for shunting trailers around. I'm sure there's a proper name for them.
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Two of those little tractor units used by ferry companies for shunting trailers around. I'm sure there's a proper name for them.
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Dunno about the British names, but elsewhere they are known as prime movers or tractor units, dare say there are many other names