Requirements of Train Lighting:
1) D.C. dynamo used to supply train lighting is of totally enclosed type and robust in construction so that road dust and jerks have no effect on its working.
2) Since dynamo has to operate in parallel with the battery, it is essential that its polarity should not change in the change to the direction of rotation of dynamo.
3) Dynamo should provide nearly constant output at varying speeds.
4) As dynamo is in parallel with the batteries and charging them, it is inherently of self-regulating.
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