Japan is said to have subtropical climate, but northern part of the country has subarctic climate. Hokkaido has been known for the coldest and the snowiest region in Japan. Global warming has caused significantly high temperature across the country in summer, but the heavy snow is still observed in the northern part in winter. Hence, railway companies have special trains to remove snow on tracks. Soya Main Line, a rural railway connecting Asahikawa and Wakkanai, is well known for having them.
There had been several types of such trains, but most of them used today are classified as Russell trains in Japanese. This is the most common and the simplest, which have a large snow plough that clears snow between and by the tracks. The term Russell derives from Russell Car & Snow Plow Company in Pennsylvania, which exported the very first rolling stock for removing snow to Japan in 1911.
There had been many diesel locomotives for dealing with heavy snow until the 2000s, but most of them retired as the amount of snowfall declined in many areas due to the global warming, and snow blowers that are smaller, cheaper and easier to use were developed. Today, Class DE15 is the only active one on the entire JR network.
The Class DE15 was developed by Japanese National Railways. 85 locomotives in total were built in 1967-81 and allocated mostly to the northern region. The Class DE15 can also haul other trains in spring, summer and autumn so that some of them are used as a shunter or for rail tours.
However, its appearance changes in winter. When snowplough units are attached to the locomotive, the Class DE15 looks completely different to its original style. In fact, the snowplough unit consists not only of a plough itself but also a cab and spare lights. The length of the locomotive is 14.15 metres (46 ft 5 in), but it will be up to 30.86 metres (101 ft 3 in) with snowplough units, describing how large the units are.
Drivers can adjust ploughs depending on the amount of snow. The photo above shows how it looks like when there is little snow between tracks. A small side plough is deployed and it scoops up some snow, but spare headlights are not turned on, indicating that just a small amount of snow is expected.
When there is more snow, both side ploughs are deployed and all headlights are turned on. This is Otoineppu village, where annual snowfall is approximately 10 metres (33 ft) and there is often 30 cm (a foot) of snowfall every single day. This is why special locomotives like the Class DE15 is still necessary.
It is hard for railway enthusiasts to catch the Class DE15. First, it mostly runs remote areas where just a handful of train services a day are available. Second, the deep snow makes it extremely difficult to access. Third, it may not run if there is little snow but cannot run if there is too much snow.
To those of you who wish to see the DE15 should be well prepared, as the minimum temperature could go well below -20 degrees Celsius (-4 degrees Fahrenheit) at night with high winds. Unlike snow-clearing trains on other lines, those on Soya Main Line run frequently (almost daily) at the daytime, but note that all of them are still marked as "runs as required", and thus their operation is not 100% guaranteed.
