The Tanfield story gets better and better. (SEV (Smith Electric Vehicles) being part of Tanfield group):
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...Smith Electric Vehicles, Europe’s largest commercial electric vehicle (EV) manufacturer.. has just produced what it says is the world’s first 7.5-tonne electric vehicle for TNT Express UK which was unveiled by TNT CEO Peter Bakker at the Courier & Parcel Despatch Expo 2006 in Amsterdam last week.
Smith buys in a regular chassis cab (in this case an Avia 75) and 'electrifies it'. The Smith Newton has a payload of 4,300kg, a top speed of 100km/h (60mph in old money) and a range between battery charges of up to 230km (about 130 miles or so). ...it's exempt in the UK from O-Licence, tachograph, Congestion Charge, MoT etc etc and also qualifies for free Road Fund Licence.
And as EVs have a flat torque, Smith says it should leave a diesel-powered 7.5 tonner for dead at the traffic lights! Being zero emission it's also ideal for stop-start delivery work in city centres, where the diesel engine is at its most inefficient. Cost-wise, it'll set you back about twice what you would pay for a diesel equivalent. But, its manufacturer insists: "You’ll more than make this back in whole life costs (based over 5 years), through fuel and maintenance savings (electric motors have 4 moving parts, compared to over 1,000 in the drive train of an internal combustion engine). And if you operate in Central London, the Congestion Charge exemption is worth an extra £8 a day on top of these savings."
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Source:
http://www.tnn.co.uk/BigLorryBlog/plonearticle.2006-10-20.0542067639