I have a bunch of these. I installed a switch in a couple of them with an LED and I use them to power sidings on a carpet layout. I put the side powering the LED to the siding, that way I have visual indication if the siding is powered. The switch is on the left, and you can see the 2mm yellow LED on the right.
Yes they can be used as block sections, just take the jumper wire off.
Can't stop working on the railroad!
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