I have been using the ones from Details West. Here is a link: http://www.detailswest.com/trackside.htm
Jim
NJ International sells some nice ones too.
http://www.njinternational.com/track.htm
I use the Grandt Line boxes, and am quite happy with them.
As an aside, I place a box at each complex of turnouts. Each box has a name with the interlocking's name. The name also appeares on the control panel switch that controls the interlocking.
Nick
Take a Ride on the Reading with the: Reading Company Technical & Historical Society http://www.readingrailroad.org/
How many of yoiu have relay boxes on your layouts and do you have any pictures ? I was looking through the recent Walthers flyer and saw the Grandt Line relay boxes for $4.98 a pair. BLMA has some new electrical boxes, that are metal vs. plastic, but they are $7.75 each. I've seen them on a couple of layoput pictures and they seem to add another level of detail. Thoughts ?
Engineer Jeff NS Nut Visit my layout at: http://www.thebinks.com/trains/