Great Western Coffee Shop

I'm not setting this as a quiz question, as most of these pictures will be blatantly obvious!

I was glad to see that the font anomaly on the Melksham station sign has been now corrected:

(http://img534.imageshack.us/img534/2920/sdc10478i.jpg) (http://img534.imageshack.us/i/sdc10478i.jpg/)

Some work has been done on the track, too - it looks much neater now (I teased Lee that it was being made ready for redoubling ::) ):

(http://img197.imageshack.us/img197/228/sdc10479pf.jpg) (http://img197.imageshack.us/i/sdc10479pf.jpg/)

(http://img709.imageshack.us/img709/2989/sdc10480e.jpg) (http://img709.imageshack.us/i/sdc10480e.jpg/)

However: my actual question is, what is this ancient, but still apparently necessary, piece of electrical ironmongery?

(http://img197.imageshack.us/img197/9871/sdc10482fr.jpg) (http://img197.imageshack.us/i/sdc10482fr.jpg/)

I'm rather afraid that you have a picture of the more southerly of the two signs on the station - the pole behind it indicates that - which has had a proper size "m" all the time.  And I was of the impression that the ancient thing is a flange oiler rather than anything electric - but thinking about it, I'm on a sticky wicket on that, and would welcome confirmation.