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Railway rolling stock (locomotives, carriages, and train units) is one of the most significant cost sources for operatorsof passenger trains, both public and private. Rolling stock costsare due to material acquisition, power supply, and material maintenance. The efficient circulation of rolling stoc
We give a new upper bound on the maximum size $A(n, d)$ of a binary code of word length $n$ and minimum distance at least $d$. It is based on block-diagonalising the Terwilliger algebra of the Hamming cube. The bound strengthens the Delsarte bound, and can be calculated with semidefinite programming
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