SBB BDt xxxxGeneve Geneve

See URL http://en.wikipedia.org/wiki/SBB-CFF-FFS_RBe_540
BDt is referred to under the heading 'Operation'.

This is it

Yet, it's must be EW II (Einheitswagen), but still don't manufacturers list. Need help with finding.

The EW I and II cars from SBB Regio trains should have been normally built by Schlieren in the 1970's like the Austrian version.