<table width="90%" cellspacing="1" cellpadding="3" border="0" align="center"><tr> <td><span class="genmed">
Zitat:</span></td></tr><tr><td class="quote"><table width="90%" cellspacing="1" cellpadding="3" border="0" align="center"><tr> <td><span class="genmed">
Zitat:</span></td></tr><tr><td class="quote"><table width="90%" cellspacing="1" cellpadding="3" border="0" align="center"><tr> <td><span class="genmed">
Zitat:</span></td></tr><tr><td class="quote">And, is "pre-signal" and "main signal" a correct term for that I'm talking about?</tr></td></table>
Leo says no:
Hauptsignal = home signal
Vorsignal = advance/approach/distant/warning signal</tr></td></table>I think "warning signal" ist the most used calling for a "Vorsignal".
Alex</tr></td></table>Sorry to disagree, but in the UK these terms all have very exact meanings.
A "Vorsignal" is
always called a distant signal. A "Hauptsignal" is a
stop signal.
Advance and Home and Starter are all different postions at stations, but all are stop signals..
This diagram explains distant, home, inner home, outer home, starter and advance starter:
http://ukhrail.uel.ac.uk/glossary/sigs.html has a good article on this with the diagrams (as animated .gif) that JB wanted.
For the US see
http://www.railway-technical.com/US-sig.html