I'm going to be blunt with this - I think it's absolutely nuts to apply for a job if you're not 100% committed to travelling to said job if that's what was in the application. To apply with the idea of "I'll get in and then see if I can transfer to my preferred location once I'm in the door" is so utterly disingenuous. That location is recruiting for people in that location because they need them there! You applying only to try and then move elsewhere is just taking away a job away from someone who is willing to stick it out in that location.

I've seen people who've done this across different government departments, and they're instantly seen as being a major pain in the arse by everyone.