While I strongly support a good rail network, while it may be possible that specific routes in the UK run at a profit, note that the vast majority of UK rail franchises only return a profit because of massive subsidies. The overall UK rail network is heavily subsidised overall - the few franchises that return more in franchise payments than they receive in subsidies hardly makes a dent in the overall subsidies.

The exact breakdown from DfT and Network Rail are easily accessible on gov.uk.