Found by accident on Regner site. An understanding of German would be a definite advantage. First off is an interview with Manfred Regner. Two minutes in is a prototype of the upcoming Piko 'krokodile' plus an interview with Rene Wilfer. Fourteen minutes in (interview with Klaus Bachmann) is an excellent 'h.o.' (?) scale overhead catenary maintenance car.
http://www.swr.de/eisenbahn-romantik/-/id=98578/nid=98578/did=7681324/pv=video/cxqaoe/index.html
http://www.swr.de/eisenbahn-romantik/-/id=98578/nid=98578/did=7681324/pv=video/cxqaoe/index.html