Well a train driver certainly earns more than a typical cabin crew member (BA WW pursers might give them a run for their money.) Then again you can train to be CC in 6 weeks, it takes nearly a year to be a train driver. (There is a thread on pilots v train drivers.)
The question of status of CC & on board rail staff is another matter. In the early days if its franchise Virgin employed consultants who found that Virgin Trains was paying its on board staff more than Virgin Atlantic was paying its cabin crew. However as someone pointed out stopovers in NYC, LA & HKG might add a bit glamour compared with a day trip to Manchester or Liverpool.
Some on train staff also have safety responsibilities, although on Eurostar as an example this is only true of the train managers. Other catering staff are employed by contractors and do not have safety responsibilities.
The aviation has probably lost some of its glamour over the years, if anything the image of railways has improved. This might affect the relative status of the two groups.