Trainspotting actor Kevin McKidd is back filming in Scotland and, once again, the subject is trains. "It all started with Trainspotting. There has to be a train involved somewhere in everything I do, it turns out," he jokes.

McKidd is back in Scotland to film the Primrose Railway Children, a CBBC family drama set to air over Christmas. The Grey's Anatomy star says it's fantastic to be back home, working with crews that remember him from early in his career. "I get very homesick.

" he admits. "I'm in Los Angeles filming for nine months of the year so anytime I get to come home and work with people from my past and connect with everybody..

. it's lovely. "I cut my teeth here as an actor doing Trainspotting and Small Faces and all those films back in the day, so it feels like coming home for me.

" Born in Elgin in Moray, McKidd started acting in local youth theatre before going on to study drama at Queen Margaret University. He found success in his role as Tommy Mackenzie in Trainspotting in 1996. Since 2008, he has played an American doctor and fans' favourite Dr Owen Hunt in Grey's Anatomy.

Voicing the characters of Lord MacGuffin and young MacGuffin in Disney Pixar movie Brave in 2012 gave him the opportunity to exhibit his real off-screen accent as well as some Doric, a dialect he heard spoken at home by his grandfather. His work on Grey's Anatomy has also allowed the actor gain experience in directing. McKidd said the Hollywood film and TV industries are starting to recognise .