Carnforth was done up years ago. It has new waiting rooms, shops, cafe etc, and even a market type thing held on the platform. None of it ever seems to be open, though. No call for it. The only trains that stop there thesedays are those travelling between Barrow and Lancaster and the occassional Arriva to York.
I went to Carnforth a couple of weeks ago, specially to have a look at the station. It's quite impressive now - I'd last been there 12 years previously when it was as run-down tip that looked to be biding its time before being demolished in favour of a glorified bus shelter. Thanks to a Friends of Carnforth Station group, they've now got a museum in the revitalised platform buildings stuffed with various bits of local railwayana, and with 'Brief Encounter' being shown continuously. The station buffet has been reinstated and looks similar to what it did in the film, serving some damn fine food - cheaper and much better than your average mainline station. The slope up from the underpass has been repainted and the station clock restored, so you can also role-play being Trevor Howard if the mood takes you...
And I don't want to be a pedant, but I ought to point out that as well as Barrow - Lancaster trains, the station is also served by Morecambe - Leeds services.