Leo,
It may have been a question of a power source. Whether the speed recorder was
strictly mechanical or required an electrical supply may be the issue. There is
also the cost of application and maintenance. Until the 1980s, most diesel
locomotives were fitted with Barco or Chicago Pneumatic mechanical speed
recorders, driven from an axle on the lead truck. They used a long chain like
grease lubricated cable in a conduit to drive the speed recorder head in front
of the engineer. Electric speed recorders started appearing in the late 1960s
and early 1970s. At first, the electric versions were strictly a read out with
no recording function. I can't find an example, at the moment, but some RRs did
have speed recorders on their waycars/ cabooses. With later model cabooses,
either a mechanical or an electric version would work. In Europe, most high
speed trains have a a speedometer readout at one end of every passenger car.
There, I think it is sort of an advertisement.
Bill Barber
Gravois Mills, MO
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