An interesting type of rail motor vehicle—an illustration of which appears with this article—has just been completed by Hardy Railmotors, Limited, of Slough, Bucks, for service on the New Zealand Government Railways. This vehicle, which is to be used as a tower wagon for the inspection and repair of overhead cables, will be used by the signal and electric branch on the electrified section of the New Zealand Government Railways between Christchurch and Greymouth, and will thus operate through the longest tunnel in the British Empire — the Otira tunnel—which runs beneath the famous Arthur's Pass in the Southern Alps of the South Island of New Zealand. The tunnel itself is about 5 1/4 miles in length, and the line through it is a single one on a gradient of 1 in 33. The shunting yard at Arthur's Pass is 2420 feet above sea level, and snow is fairly constant during the winter months.