On 21/04/2011 09:20, pippa.moran wrote:

Arthur Figgis wrote:

On 20/04/2011 22:40, Jack Taylor wrote:


"Instead of using traffic lights trains are linked by radio waves which
'talk' to trackside responders. These in turn send a signal to a
computer in the train engine to speed up or stop."

Other than being electric multiple units (which normals wouldn't
understand) and so not having an "engine", isn't that more or less how
it works?


What do mean, no engine? Unless the trains are pulled by horses, or
the passengers have to get out and push, there must be something -
some sort of mechanism or machinery - inside the train to make it
move. In other words, an "engine." How could it move without one?

Gravity has been used, or cables operated by an engine not inside the
train. "Engine" is also used in the sense of "locomotive".

--
Arthur Figgis Surrey, UK