I’ve just fitted MP1 point motors to (tt120) shelfie5, and they have built in frog switching polarity. They’re also compact, so may be worth investigating if you’re looking to activate the three way. Mine are powered from an old mobile phone chargerIn other news, I have been working on a rather old layout.
Ranelagh Bridge was built around 2012 by a friend of mine and featured in BRM in July 2014. It was exhibited at a number of exhibitions for a few years then quietly retired.
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At some point, it found it's way to Lord and Butler, where it it appears to have had some work done to it...............It was certainly not as built by my chum.
When I started there, some four and a half years ago now ( ! ) it wasn't really doing much, other than taking up rather a lot of much needed space. It wasn't operable and frankly looked unfinished and a bit of an eyesore. I offered to store it, with a view to improving both it's appearance and allowing something to move about.
Well, I finally had a look at what was involved a couple of weeks ago. It wasn't encouraging..Who ever had tried to up date the wiring, had simply ( in my opinion ) had just over complicated things and had actually not covered the basics. The layout was DCC. Keeping it simple, the layout needed to have the track live ( obviously ) and the presentation needed improving, mainly because it looked unfinished and essentially crap following it's " upgrade ".
Wiring was a nightmare and the layout was hugely over weight.
First job was to a few pounds and everything, backscene, 'roof' and ends all came off. It had also been extended using a lump of 3x 2 at one end where a bathroom mirror had been added.......
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The wiring was a nest which seemed to have been added to without any real plan..Colours changed on runs and multiple wires stuffed into screw terminals. I am as far from an expert on layout wiring as you can get and as a result, it has to be simple. This was not simple. Bizarrely, the point motors were wired, but there was no provision to make them move or in fact power the frogs. I am not about to lift the track so that was out though to do it properly, that should be done. So I've decided to dispense with that as it really isn't needed for what will be a display/ test track..
Literally, yards of predominately red wire have therefore been cut out.
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The track is now 80% powered. The stumbling block is a Peco asymmetric 3 way point which has no power whatsoever going to it but given it's location, it leaves a small section of the layout unpowered. Access to the rest is fine and will be sufficient for what is required of the layout.
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This is proving to be an interesting exercise. The on layout lighting to buildings and lamps is being worked on and should be completed over the weekend and I hope to start on the replacement backscene and fascia, etc.
I will update accordingly.
Rob.

This was before a subsequent tidy up of the wiring, as I too am back of the class material for wiring students!
All it really needed was labelling to avoid that 
