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The AVA bridge at McNealy-Brown's yard in Kent

The AVA bridge deck showing the glass panels and lighting strips, at McNealy-Brown's yard in Kent

A Chiltern Railways train runs past primroses near Denham, Bucks

Network Rail Ecologist Sam Jones puts a bird box up a tree near Denham, Bucks

Primroses by the lineside, growing thanks to tree canopy being cut back

False Stag Beetle in a tree stump, at Denham, Bucks

Arborists Chris Callaghan and ecologist Sam Jones with a bat box and sustainable warning sign.

Rendering of a high speed train on California's high speed railway. Picture: California High-Speed Rail Authority