In message , Clive D. W. Feather
writes
For example, third rail running rails need to be isolated from earth
to keep stray voltages away from underground pipes, but 25kV AC running
rails need to be grounded. Dealing with the interface is, um,
interesting.
Are you saying that traction current is the major problem when dealing
with the two different types (ac and dc)?
--
Clive