Not really.... i'd say train drivers are. They also, generally speaking, earn more than cabin crew. That said, train driving isn't particularly skilled either. Basically, with training, most of us would be able to do it unlike a true skill such as joinery where theres probably a good chance that many of us would be truly awful at it and just don't have the 'nak' for it. For that reason I would place train driving in the semi skilled category. Some would argue that cabin crew are in that category too. Interestingly, back in the day the two roles probably earned about the same but now there are an endless supply of people who want to crew.
Junior crew usually earn between £18K-23K whilst a new train driver on local/regional services probably earns around £30K-35K. Interestingly here in Manchester the drivers on the tram network which on many parts of the network operates just like a train and at the moment still uses block signalling like trains do (rather than driving using line of sight), only earn around 20K.