Description
Twenty-three units were built in three different batches.
- 601-608 - Two-car units
- 611-618 - Four-car units containing a griddle car
- 621-627 - Four-car units
Each unit had identical electrical equipment. The original concept called for increasing the power-to-weight ratio when strengthening trains from eight to ten cars in peak periods using the 2-car units, in order to make the peak timetable more resilient.
Read more about this topic: British Rail Class 309
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