Russ. Many thanks for your response to mine. Having been involved in rolling stock development for many years, I found the details you posted very interesting. With the advantage of hindsight though one must suppose that the development was speculative, with little chance of commercial success because of the higher manufacturing and maintenance costs of mechanical designs. Electrical/electronic ones are therefore adopted whenever possible. Being a member of both the IET and IMechE, I seem to have backed both horses. Mike
Russ. Many thanks for your response to mine. Having been involved in rolling stock development for many years, I found the details you posted very interesting. With the advantage of hindsight though one must suppose that the development was speculative, with little chance of commercial success because of the higher manufacturing and maintenance costs of mechanical designs. Electrical/electronic ones are therefore adopted whenever possible. Being a member of both the IET and IMechE, I seem to have backed both horses. Mike
