Thanks for your reply, in this particular case the name wasn't a trademark at the time of registration, but is now an active trademark.
Seems to be a bit of a sticky situation, as it would be hard to prove they were trying to extort anyone, or use a trademark for financial advantage. Just because you have "apple" as a trademark for electronic, it doesn't necessarily mean there can't be an "apple" locomotive.
With the domain being inactive it somehow seems reasonable that you should atleast be able to get a reply/quote or the like from the registrar.
The registrar unfortunately has an obligation first and foremost to its customer. You can't really force them to assist you or help you get in contact with the domain's owner. Legally speaking, it may be the safest position for them to just not communicate to a third party anything about their customer (though they could tell you just that).