Advice sought on relays and associated electronic circuitry .

Hi , as a novice on electronics I need some advice as to whether a project started by my late father which I am trying to complete is viable as per the attached amateurish circuit diagram ( my one and not the Lenz one lol ) .I should explain that I am trying to operate 2 Seep N gauge electromagnetic uncouplers via 2 outputs of a Lenz LS150 accessory decoder and using 2 IN 4001 diodes as per the Lenz instructions to produce a 2 wire output as used for stall motor type points machines , the LS150 outputs approx 15 volts AC from it's initial 16 volts AC supply or rather I think it's an AC output but am not sure if the diodes rectify the current to DC ? ,I want to use the 2 LS150 outputs to trigger 2 non latching relays ( advice sought on type) to provide 18 volts DC to the 2 uncouplers from a seperate and dedicated 18 volt DC PSU , if the LS 150 is still outputting AC rather than DC with diodes in place ? I have a block signalling PSU1 device which can convert the AC to DC and offer 3 12 volt DC outputs to send the signal voltage to the relays , I hope this makes sense as my use of terminology is most likely incorrect ?.