The length of a train may be measured in number of wagons (commonly used for bulk commodities such as coal and iron ore) or in metres for general freight. On electrified railways, particularly those using lower-voltage systems such as 3 kV DC and 1.5 kV DC, train lengths and loads are often limited by traction and power supply constraints.
The length of a train may be measured in number of wagons (commonly used for bulk commodities such as coal and iron ore) or in metres for general freight. On electrified railways, particularly those using lower-voltage systems such as 3 kV DC and 1.5 kV DC, train lengths and loads are often limited by traction and power supply constraints.
Source: Wikipedia "Longest trains" · CC BY-SA 4.0
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