Given that the events take place between 1913 and 1915, we should not see a steam train bearing the British Railways logo.
Someone has already alluded to the steam loco being in BR livery but the problem is much more severe. The loco is a Black Five locomotive of the LMS, no. 45337. The scene is apparently set in 1913. The LMS didn't come into existence until 1923, ten years later. The Black Five class didn't go into production until 1934, twenty one years later. No. 45337 wasn't built until 1937, 24 years later. British Railways started in 1948, 35 years later. The BR crest shown on the loco is one adopted in 1949, 36 years after 1913.
Some of the men have belt loops on their trousers but belt loops were not invented until 1922.
The leather T-section soccer ball the girls are playing with was not around until the 1950s.