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Kay (Tithe Barn Primary) sent in this solution:

The route to be followed is from the Train Yard to A - B - L - M - D - C - Q - R - E - F - N - O - K - J - I - H - G - S - P - return to Train Yard.

Thomas (Tithe Barn Primary) sent in a different solution, starting from the Train Yard and says:

The order could be reversed by starting in an anticlockwise direction:

P I J A B L K O H G S R E F N M D C Q Train Yard

Holly (from Bristol) sent in yet another solution:

UREKA! I have found out how to do the Rail Network. Does it go from the

Train Yard-p-s-r-q-c-d-e-f-g-h-i-j-k-o-n-m-l-b-a

Weiye took a different approach, starting from the middle:

N--M--L--K--O--H--G--F--E--D--C--B--A--J--I--P--S--R--Q--Train Yard