Good performances from the cast. My only reservations are a) the synthesized music score: entirely wrong and anachronistic, and doesn't help create the mood and atmosphere; b) the locations, while totally accurate for the period, are more like a museum, with the cars and trains improbably - even impossibly - spotless, sparklingly clean.
I grew up in England during the 50s, and the trains (both locomotives and rolling stock) were invariably grimy, and certainly not anywhere as impossibly immaculate as shown here. The only times trains were spruced-up to look as shiny-new as there are here , was for state funerals or the arrival of foreign dignitaries, or for the first day of service. Just check footage and stills from the period!
The same goes for the cars and one bus!