The Alan Turing Cryptography Competition

From the people behind the MathsBombe Competition.
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Chapter 4

You'll have to get your paper out for this one and no sitting on the fence with the answer to the question? Have you seen any trains on the rails recently?

M

Above is the image attached to Mike's message. When decoded, it is a question. You must find the answer and type it into the box below.

This problem was first solved on Mon 8th February at 4:08:05pm
Alan Turing Cryptography Competition 2021 is organised by the The Department of Mathematics at The University of Manchester.
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