All of these images are of stations in Kent and all came from the same batch of negatives that I purchased in March 2013. I haven't seen anything in the images that discounts the idea that they are taken at a time just before the second phase of the Kent Coast electrification was implemented. All locations show signs of works associated with the electrification, new third rail and platform extensions being the most significant.
Presented in alphabetical order.
Bekesbourne
Bekesbourne was opened in July 1861 and the station buildings lasted until 1970 when they were replaced with bus shelter replacements, themselves replaced in 1991. The station remains open to this day.
This shot of Bekesbourne's main up side building is taken from a train. Bekesbourne is the odd one out in this set as the line through here was electrified as part of phase 1 of the Kent Coast electrification with a full electric service in place for 15th June 1959.
Note the new platform extension just past the footbridge, the platforms having been extended to 12 car lengths as part of the electrification scheme during 1958.
Also note the provision of fire buckets, three under the 'Gentlemen' toilet sign and another three by the rubbish bin in the bottom right corner.
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Folkestone Junction
Folkestone East was the first station to open in Folkestone in 1843 and at first was very busy with traffic to and from the continent via the harbour. With the opening of the Harbour branch in 1849 the boat train traffic transferred to Folkestone Harbour station and the station renamed Folkestone Old. In 1852 the station was renamed Folkestone Junction, in 1858 Folkestone Junction (Shorncliffe). In 1863 a renaming back to Folkestone Junction which remained until 1884 when a renaming to plain Folkestone took place. A third renaming to Folkestone Junction in 1897 was the penultimate renaming, the final renaming to Folkestone East taking place in 1962 upon electrification.
In 1863 Shorncliffe Camp station (now Folkestone West, see below) opened and traffic further declined.
The line through the station was electrified (one of the main inputs from the National Grid is located here) and a full electric service commenced in June 1962. The station closed in 1965.
This view from the Up platform shows the original staggered platforms together with the concrete extension of the down platform, put in place for the electrification, which only lasted until 1965 when the station closed.
This second image is closer to the footbridge than the previous image and shows the Up side platform extension just past the foot crossing together with a support in place ready for when the dip in the platform by the foot crossing would be bridged. It also shows a further extension of the Down platform towards the signalbox. Loco hauled coaching set 559 berthed just to one side of the footbridge. Just past the crossover in the middle distance conductor rail has been installed, the section between Folkestone Junction and Ramsgate full electrification in place and substations operational by the end of 1959.
Both images show the semaphore signals and signalbox still in use. They also show new conductor rail in the four foot of the Up line and new insulator pots in place on both lines.
A temporary electric service in steam timings commenced 12/06/1961 and a electric full service 18/06/1962.
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Folkestone Warren Halt
This small halt was originally opened in 1886, but didn't last long, closing before the end of the year after it became involved in arguments with Lord Radnor (who's land was being trespassed on by the passengers) and the Board of Trade as to whether or not the station had proper authorisation or not. It reopened in 1908 until December 1915 when a landslip engulfed the halt and mainline which remained closed until 1919. The station was rebuilt in 1923 and remained open to the public until 1939 when there was a further landslip. The platforms remained in use for staff purposes until 1971.
This view of the halt shows conductor rail in place and new fence posts in place, but the chain link not yet installed. There are wagons in the far siding and the signal visible for the Up line is in the off position.
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The line through this station was opened in June 1843 and a branch line to Hythe and Sandgate was opened in October 1874. However a station was not provided at the junction until 01/01/1888 when Sandling Junction station was opened. The station had four platforms, up and down mainline and up and down branchline. Cutbacks on the branchline commenced in 1931 and the branch was closed completely in December 1951 and the station renamed Sandling for Hythe.
This image shows the camping coaches converted at Preston Park from wooden bodied Pullman cars that arrived in 1960, which gives us the earliest year that this pair of pictures was taken. The station buildings in the background are the branch buildings and are now demolished.

This second image also has a glimpse of one of the camping coaches and also shows the signalbox and semaphore signals still in use and no signs of any replacement colour light signals. The replacement signals were brought into use 18/02/1962 which gives a latest date for these images. The structures on the down platform, on the left in this view were demolished in 1970.
Now named Sandling the station is still open with the Channel Tunnel Rail Link (HS1) running parallel.
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Shorncliffe
This station, originally opened in 1863 as Shorncliffe Camp, renamed Shorncliffe in 1926, and finally renamed Folkestone West 10/09/1962 after electrification and is still open.
Once the nearest station to the junction with the Elham Valley line to Canterbury at Cheriton Junction, Shorncliffe's importance as an interchange declined after the closure of that route in December 1940.

This view looking towards Sandling is an interesting one, as it is mid way through the electrification and resignalling process. The new conductor rails are laid, the platform extensions are in place but all of the semaphore signals are still present and operational from the signalbox, with no signs of any replacement colour light signals. Additionally the extended farther platform has a temporary wooden extension leading towards the signalbox that follows the original layout of the platform loop. As part of the electrification scheme the number of lines through the station was increased from three to four, these being up and down platform lines and up and down through lines.The signalbox had to be demolished after the commissioning of the new signals as it was in the path of the track for the platform extension, the trackbed for this just past the box appears to be freshly ballasted in preparation.
Of interest is the rake of loco hauled coaches in the bay to the right.
The station is still open but with the through lines removed after the channel tunnel opened and boat trains ceased using this route.
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Sources used:
Southern Electric 1909-1979 by G.T.Moody ISBN 0 7110 0924 4