It will say destination C, but it will also say the calling at stations. For example: The full route is Oxford to London Paddington departuring at 11:01 in the morning. You want to get off at Reading, a station between Oxford and London Paddington. On the screen, you will see big letters 'LONDON PADDINGTON' as the destination. You will also see small letters 'Reading' below the big letters, under 'calling at'. Also the broadcast will announce like this: 'The train now departuring from Platfor 1 is the 11:01 First Great Western train to London Paddington. Calling at Reading, Slough and London Paddington'. So you will hear the broadcast if you cannot understand the screen. Or, ask a train station staff for help. He/she will tell you which platform will be your next train.
For example:
The full route is Oxford to London Paddington departuring at 11:01 in the morning. You want to get off at Reading, a station between Oxford and London Paddington.
On the screen, you will see big letters 'LONDON PADDINGTON' as the destination. You will also see small letters 'Reading' below the big letters, under 'calling at'.
Also the broadcast will announce like this: 'The train now departuring from Platfor 1 is the 11:01 First Great Western train to London Paddington. Calling at Reading, Slough and London Paddington'. So you will hear the broadcast if you cannot understand the screen.
Or, ask a train station staff for help. He/she will tell you which platform will be your next train.