. On the "White Pass" pay-roll . ted light tramway with heavy gradients,especially during the winter, and how theywould avoid accidents on their heavy gradi-ents when they tried to run heavy loads overtheir light tracks in the busy summer season,and how many tons one of their light engineswould be able to pull up the hill, and whatthe cost per ton would be. The railway line was built in the belief thatthe line that would pay best was a well locatedone, with the lowest possible gradients and avery solid roadbed over which heavy enginescould haul heavy loads up the hill in summer-time, and which
. On the "White Pass" pay-roll . ted light tramway with heavy gradients,especially during the winter, and how theywould avoid accidents on their heavy gradi-ents when they tried to run heavy loads overtheir light tracks in the busy summer season,and how many tons one of their light engineswould be able to pull up the hill, and whatthe cost per ton would be. The railway line was built in the belief thatthe line that would pay best was a well locatedone, with the lowest possible gradients and avery solid roadbed over which heavy enginescould haul heavy loads up the hill in summer-time, and which would admit of modem ap-pliances for snow fighting in the winter. Itwas believed that with the aid of such ap-pliances the line could be kept open through-out the entire year in spite of what the wisemen said. But the first essential for successful snowfighting on a railway, especially in the moun-tains, is a solid roadbed, able to stand theenormous strain involved in the working of abig rotary snow plough pushed into the [ii6]. < H u^ Rail Division heavy snow banks and drifts by two andsometimes three heavy locomotives. Asrotary snow ploughs are not common inEngland, it may be well to explain that theyconsist of a long, narrow sort of house ontrucks, enormously strong, and containing alarge boiler and powerful engine for workingthe rotary knives. These knives are set in theform of a wheel on the front of the machine,having a large diameter and revolving atright angles to the track at great speed insidea hood, but open at the front where the knivescome in contact with the snow bank or revolving knives slice away the snow asthe rotary is pushed forward by its attend-ant locomotives, and the snow as it is slicedaway by the knives is thrown into the hoodand whirled away by centrifugal force to agreat distance clear of the track. Thesemachines can deal with snow-banks upto about 12 feet deep, but in deeper snowthey tunnel or choke themselves, and itis then necessary t
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