The sleek lines of the HST 125 High Speed Train represent a massive stride in British locomotive design in the latter part of the twentieth century. With two power cars the HST - otherwise known as the British Rail Class 43 - has a top speed of 125 mph, making it the fastest diesel-powered train in the world at the time of its introduction. Although nearing the end of its service life, recent refurbishments will give the HST another ten years in mainline...