The co-ordinates given are not the cache, but the bus stop just outside the station. The cache is a short walk away.
A quick puzzle to exercise the grey cells a little, but it should be pretty simple.
The cache co-ordinates are;
N52 28.abc
W1 47.def
The station redesign by Tim Tolkien was completed in 199a
b = The number of platforms +1
c = The number of running lines x2
d = The number of points + the number of sidings + 1
e = Second digit of the number of steps leading down to each platform -1
f = g x2, where g is "The station was opened on 1st May 19g9
The area is likely to be very busy so a great deal of stealth will be required at times. Indeed at certain times it may be virtually impossible, however when placed it was fairly quiet.
One of a number of mosaics outside the station
