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N 52 AB.CCD E 001 EE.FGH where the letters A to H can be found from the following clues:
A = Number of Railway Series book titles by Rev. W. Awdry that do not feature the word "engine" or "engines"
B = Percy the Small Engine's number
CC = Number of Railway Series books written by Rev. W. Awdry
D = The number of named buses in the Railway Series books
EE = The last two digits of the year the first Railway Series book was published multiplied together
F = The number of "Railway Engines" in the first Railway Series book
G = Edward the Blue Engine's number
H = The number of illustrators used throughout the Railway Series
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