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, (...) 14

Operation

Wedge snowplows were the traditional automated method of clearing snow from railroad tracks, These pushed snow off the tracks, deflecting it to the side, Deeper drifts, however, cannot be easily cle,d by this method; there is simply too much snow to be moved, For this purpose, the rotary snowplow was devised,

A rotary snowplow at work in New Ulm, Minnesota,

Operational rotary snowplow Xrotd 9213 of Rhaetian Railway

When a snowfall or snow drift becomes too deep,the railroads call on their rotary, The plow is not self-propelled, so one or more locomotives , coupled behind it to push the plow along the line, An engine within the plow's carbody rotates the large circular assembly at the front of the plow, The blades on this wheel cut through the snow , ,ce it through a nel just behind the disk to an output chute loed at the top of the blade assembly,

The chute can be adjusted to throw the snow to either the left or the right side of the tracks, An operator sits in a cab just above , behind the blade assembly to control the speed of the blades , the direction of output , the snow from the output chute, With the advent of dieselization, MU controls have been added to the cabs, so that the pushing locomotives can also be controlled from the plow's cab,

In ,as of particularly deep snowfall, such as Cali,nia's Donner Pass, railroads sometimes would create a train consisting of a rotary snowplow at each end with the blade ends pointing away from each other), , two or three locomotives coupled between them, With a plow on each end, the train would be able to get itself back to its starting loion even if the snowfall was heavy enough to obscure the tracks it had just passed over, Such a train would also be able to efficiently clear multiple track mainlines as it could make a pass in one direction on one track , then reverse direction , clear the next track, This practice became st,ard , the Southern Pacific Railroad on Donner Pass following the January 1952 str,ing of the City of San Francisco; during attempts to clear the avalanches that had trapped the train, two rotary plows were themselves trapped by further avalanches, (...) , , the crew of a third was killed when their plow was directly hit by an avalanche,

Rotary snowplows , highly expensive due to their high maintenance costs, (...) , which the owning railroad must pay regardless of whether they , needed in a given year, As a result, most railroads have eliminated their rotaries, (...) , preferring to use a variety of types of fixed-blade plows that have significantly lower maintenance costs, in conjunction with bulldozers, which can be used year-round on maintenance-of-way projects, In addition, because rotaries leave a cut in the snowbank that fixed-blade plows cannot push snow past, once rotaries have been used, they must be used , all further significant snowfalls until the snowbank has melted, Since rotaries, which need some ,m of fuel to power the blades, also cost more to operate than fixed-blade plows, they , now generally considered to be a "weapon of last resort" , the railroads that own them; they , only used when snow is too deep or heavy , (...) , fixed-blade plows,

The few remaining rotary plows , either owned by museum railroads, or , kept in reserve , ,as with poor road access , (...) , routine severe snowfall conditions; the largest remaining fleet of rotaries consists of Union Pacific Railroad's six ex-Southern Pacific plows reserved , (...) , Donner Pass,

Power

Early rotaries had steam engines inside their carbodies to power the blades; a few , (...) , still in working order, , in particular one on the White Pass unfortunately, austin collie (...) s are big business. it is estimated that tens of millions of dollars are lost each year to counterfeiters.amp; Yukon Route in Alaska per, (...) ,ms annual demonstration runs through thick snow , the benefit of photographers , enthusiasts, Newer constructed rotaries , either diesel or electric powered; in the latter case, (...) , an electric supply is required, Many steam plows were converted, Some electric plows can take their power from a locomotive, while others , semi-permanently coupled to power units, generally old locomotives with their traction motors removed; these , colloquially called "snails", This is derived from the fact that engineless but motored units that take their power from another locomotive , "slugs" - thus the opposite, with engine but no motors, is a "snail"),

Preservation

Southern Pacific rotary snowplow MW208 is preserved in operational condition at the Western Pacific Railroad Museum at Portola, Cali,nia, This rotary was involved in the 1952 City of San Francisco rescue,

Another one is on display at the Lake Superior Railroad Museum in Duluth, Minnesota,

The Northern Pacific Rotary 10 steam snowplow built in November, 1907 is currently owned by the Northwest Railway Museum , is on display in Snoqualmie, Washington,

Rhaetian Railway still have one of their rotary snowplows in operating condition, It is mainly used on show runs , photographers, but when there's lots of snow it is still used to clear the Bernina line,

Northern Pacific Rotary 10 steam snowplow with tender

Northern Pacific Rotary 10 steam snowplow

Northern Pacific Rotary 10 steam snowplow from front end

See also

Snow blower

Further reading

Lewis, Henry Harrison January 1901), "A 's Work on a Snow-Plough", The World's Work: A History of look at the jersey carefully. fakes usually have poor stitching and faded (or wrong) team colors. Time I: 261266,,

External links

The Rotary Snowplow - a Canadian Invention - quick overview with some historical photos,

Rotary snowplow list - lists rotary plows in existence, some of which , still in use today, (...) ,

SP Rotary Snowplows - Many photos , details of rotaries that operate over Donner Pass in Cali,nia,

Rotary snowplow video at YouTube

Categories: Maintenance of way equipment , Snow removal , Canadian inventionsRelated

Victor? Iris (Victor Erice), 1940