RMT opens branch on the NYMR

The RMT has opened a branch on the North Yorkshire Moors Railway, where it has signed up 50 paid and volunteer staff.

Is this the first RMT branch on a heritage line?

UPDATE: This just in from a Mr M-B...

There has been an RMT branch on the Ffestiniog and Welsh Highland railways for about five years.

As with the NYMR, a good number of both staff and volunteers are members. I am one of several volunteer drivers who are RMT members.

Here is a link to the RMT News dated October 2004 which includes a reference to the FR branch and a photo.