Design
The Southern fleet are fitted with coupling devices (Dellner) different from other Turbostars, and are classified as Class 171 for this reason. The four-car units were built with the new couplers, but Class 170 two car units were fitted at a later date, and reclassified as Class 171/7 after the modification. Three more two-car units were later acquired, but these were built from new with the new couplers.
Southern gained 170 392 from South West Trains. The coupler on this unit has also been changed to the Dellner type. The unit has been reclassified and renumbered from 170 392 to 171 730. Ironically this unit was first delivered carrying Southern livery and the number 170 727 (this was due to the fact SWT needed another 170 and it was cheaper to place another unit on the Southern order than place a new order). It never operated in this form and transferred to South West Trains where it became 170 392.
These trains have electronic automated station announcements and onboard displays unlike their predecessors.
Read more about this topic: British Rail Class 171
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