Dry Transfer Lettering... Removal

[iis612]

I highly doubt this is the right part of the forum for this post, but the closest match for the issue is Weathering, but I was looking for an area that gets more traffic, so that way I can get more opinions.

Now, on to the matter at hand. My Father in law is an avid locomotive collector/builder. He does not want a layout, just the locomotives. He has started to hand some off to me, so that he might see them on a layout rather than a test track. He gave me an old Bowser Pacific that is lettered for a freelanced road using dry transfer lettering. I need to re-letter it. What is the best way to remove dry transfer lettering, without damaging the finish?
I will gladly post pre and post pics once a get a bug worked out with my photo viewing software.

Thanks in advance,
Matt