German Signalling Question

Hi all. I was wondering if anyone knew off hand what the big W is for in the attached screenshot. I've also see it in HHL and HMA near depots.

Thanks.

 

Ra.11. Wait for the signallers permission before shunting past.

 

http://www.sh1.org/eisenbahn/snsh.htm

On this page you'll find your answer. You'll have to read some additional information to understand it completely. (Wich I don't do fully yet)

This site is also a good guide to other German signals.
http://www.sh1.org/eisenbahn/s.htm

Edit: nr2 on the ball, nevertheless that site above is good.

 

Excellent! Thanks