Barrier strips

Radio Shack also sells a "jumper strip" that is placed under the screws on one side of the barrier strip. This jumper can be shortened as needed.

 

I would break the jumper and install it under four screws for the "hot" supply connection. This would give you eight posts fed from the one hot feed. Then do the same for the other four screws, and connect the common to that group.

 

I find that when using crimp-on eyes, forks, etc. that I can get two of them under each screw, so the number of connections can be doubled.

I have used this method for buildings with many lighting features:

 

 

I first connect half the terminals together to make them common to each other. I then connect the remainder of the terminals to make them common to each other. I bring in the two leads of power - one to each and the connect one lead from each light to the two separate sections. 

 

As you can see in the photo above, one of the leads from under the building connects to the right side, the other to the left. All pairs of light leads coming to the strip are one left/one right. This provides a central source of power for as many lighting features as are used. 

I have seen HO track used for this purpose. it was mounted behind the buildings or you could  put it under the benchwork connect your wires to the rails and liven the track. you can power many buildings this way

Miller Engineering make an excellent power distribution board. I have several of them in use. 

I've seen 3 types of them...not connected (Home depot), connected with removable connectors, and connected (like the Miller one shown). I use the connected ones.

On the Shack strips, I have used a bare wire running under one set of screws as a terminal connector.  Also, the RS strip can be cut so you can use fewer terminals, or to use on smaller, 2 and 4,type terminals.

I have a couple from MTH. They are similar to the Miller Eng strips.

MTH makes them in both 12 and a 24 pair blocks as well.

I use copper "bus" bars (strips) which I purchased on Ebay. I have small 9 position strips and larger 23 position strips. These are handy when connecting to the "IN" terminals on MTH 50-1004 AIUs. All my "IN" connections are tied to "common" for both SW and ACC connections.

 

NOTE: These "bus" bars are solid copper and have screw terminals. They will accept a variety of sizes of wire and provide a very solid connection.

Here's how I wired my Miller Engineering signs: note the jumper strip on one side of the barrier strip.

The jumper strips by Radio Shack that Win86 refers to is the best and least expensive way to power all 8 ports on a barrier strip with 1 wire. I have done this on my layout many times with no problems.

Found a few after dismantling - still have a bunch to disconnect in buildings and under the layout:

 

 

Shorting Terminal Block: Here is a handy 9 posiiton "bus" bar for connecting to a common signal. I use these for connecting to the AUX terminal on all my turnouts. (I use AUX power instead of track power for turnout control.)

 

Here is another 21 position bus bar terminal block.  I use this one for connecting to the IN terminals on my MTH 50-1004 AIUs.  It is a Cutler-Hammer type GBK21.