What is available to have power to a siding pull a engine in and not have power to that siding but you can run trains on your main track
A toggle switch, insulated rail joiners and a couple of wires.
Or a power routing turnout like Peco.
Sid
rlb
Assuming you are DC and not DCC, what Sid is talking about is block control. To make it easier for you to understand, click on the link and scroll down to cab control.
http://books.google.com/books?id=4633V-K0ZQcC&pg=PA22&lpg=PA22&dq=model+railroad+cab+control+block+wiring&source=bl&ots=0lEaun1HqP&sig=2K-F29Ky3va7uO5yip-sYAnEqdA&hl=en&sa=X&ei=AxyDUf6oNIi5rgGMkoHABw&ved=0CGEQ6AEwCA#v=onepage&q=model%20railroad%20cab%20control%20block%20wiring&f=false
Jerry
Hi rlb,
Sid and Jerry covered the bases, what turnouts are you using?
DC or DCC?
Using DC
If you're using power routing turnouts then nothing more is needed.
If not, then as Sid said.
Here's a good link to basic wiring;
http://www.nmra.org/beginner/wiring.html