To find this cache you will need to find the answers to the following questions about Market Harborough Railway Station. They can all be found online and using google street view.
A = The number of platforms
B = The clearance in meters for road vehicles under the centre of the bridge next to the station B.0meters
C = The year the original station opened 18C0
D = When was the station building restored? 19D1
E = At its height the station was a junction for how many directions?
F = How many miles is the station from Leicester? 1F
N 52 AD.B(C-B)B
W 000 CE.ABF
The cache is located in a place where the former London and North Western Railway (LNWR) line used to run through Harborough, although it may be hard to believe today. This was the first railway line to reach Harborough but was closed in 1966. The line originally ran from Rugby to Market Harborough. You'll need your own pen to sign the log and I'd recommend some tweezers.
You can check your answers for this puzzle on GeoChecker.com.