I don't think you're going to find any travel company or hospital that will train a travel nurse in a new specialty. As a traveler, you will be given 1, maybe 2 days of orientation, and then you will be expected to function completely on your own. Because travelers are expected to "hit the ground running," most hospitals want you to have 1-2 years of experience in your specialty before you travel. If you really want to switch, you'll have to take a job as a regular staff nurse, train in your new specialty for 1-2 years, and then hit the road again. Sorry- that's probably not what you want to hear, but that's how it is....