fox hunting by the railway viaduct, Vielsalm, Belgium, 1930

This viaduct in the Ardennes was blown up by the Belgian army in May 1940 to slow down the invading German army.  It was on a low traffic line and wasn't ever rebuilt; most of what was left of it was removed in 1952.  More info here

The scene on the poster looks very British and the lady on the left is riding side-saddle which doesn't seem very safe when the horse is jumping over a hedge.