Passengers using the First Great Western trains have contacted rail bosses repeatedly this week to express their disappointment over the problems they regularly face.
These include overcrowding, late-running trains and standard class passengers packing into first class seats, with a lack of ticket inspection to prevent them from doing so.
On Monday morning passengers waited on a crowded platform at Maidenhead for more than five minutes while a train sat with first class locked and dark and standard class already full.
In a statement, FGW managing director Mark Hopwood said the capacity of its services had been put under 'real pressure' by increasing demand.
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