Are the crossing lights coming on? I would think they and the solenoids are connected in parallel and no one is dependent on another. Two solenoids failing at the same time seems an unlikely problem.

I think you have a problem other than a failure of the crossing. I can't see all four elements (edit: six elements- 4 lights and 2 solenoids) failing at the same time. If this is like my M track version, you could test it by removing each half, connecting yellow to the terminal on the side of the half and connecting brown to the contact that makes with the track piece. After that, then you need to find if it's the yellow or brown that is open on your circuit and preventing voltage from operating the crossing.

I am going to go very basic here, please do not get upset if it seems I am trying to make it oversimplified.
The circuit for this device, like all electrical devices needs two connections. One to plus and one to minus, or if an AC circuit, one to hot and one to neutral (sometimes mistakenly called ground). The terminal in the side of each road section goes to yellow. This is plus or neutral depending on the type of power used to operate the device, AC or DC. The metal clip in the road pieces that connects to the railroad track center piece goes to the insulated rail. This rail is identified with red paint near the rail. Your rolling stock wheels then connect this insulated rail to the unisulated rail which goes to brown. The wheels are your "switch" just like a light switch on your wall. They make the connection closing (completing) the circuit. I would remove the mounting screws and pull the road sections away from the center track section. Leave the yellow connection to each road half. Now take a jumper from the center rail contact on each piece of road section to your track bed, not the insulated rail. If it works, you have a good connection to yellow, but your connection to brown is bad. If it does not work, you have a bad connection between the road halves and yellow. Test this with a jumper from your yellow on your transformer to the connection on each half of your road section. Leave them loose from the center rail secion keeping your jumper from each road section to the road bed. If this works, then remount the road sections and run a railroad car across the track section. Leave your temporary jumper to yellow intact. If this works, then you have a bad connection between the road sections and yellow.

Exactly. If you have something with an alligator lead, even better. Basically you are replacing either the yellow or brown connections with the jumper trying to decide when it works, isolating the problem. It is either no yellow to the road sections, no brown to the track bed. Or no connection from the isolated rail and then on to the connection where the road section connects to the rail section in the middle. This last I would consider highly unlikely since it can only be disturbed by removing a piece of the crossing. Jump around each until it works, then figure out what is wrong with that part of the circuit. If you have two power sources and use a common neutral (brown) it may simply be the browns on both power supplies are no longer connected together. This or your yellow to each road section is the likely cause.

The new level crossing was fitted yesterday. The code no hasn't changed but I have to say the crossing it self is a lot better than the old one. With the old one both the lights flashed together and as soon as the train left the senser area the barriers would go up. With the new one the lights alternate when flashing and when the train moves out of the area the barriers slowly go up. We were a bit concerned because the crossing goes over 2 parallel tracks but 1 one of the barriers goes 90 degrees to the track. So we checked to make sure the new item work in the first place then we cut the 4 wires and extended then by 300 mm. It works a treat. I just have to re ballast the track leading up to the crossing and that is the last job to do before I have my 2 open days this weekend.

Charles.

Indeed, I got mine today, and put the grey wire on the wrong side, and the crossing didn't work!
Great looking though!