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scr half wave phase control circuit

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toppytop

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120 vac in 18vac out

I would greatly appreciate someone to help me out with this design. What I am doing is controlling a Lionel train with a simple triac/diac (actually a Quadrac) type control for a fan motor at 120 VAC. I can wire the control on the primary side of my 120 VAC to 18 VAC transformer and it works fine to control the train. My problem is I don't want it on the primary side I want it on the secondary 18 VAC side. I can run multiple trains from this transformer and just need individual controllers. The breakover voltage of the diac is too high for this lower voltage. I must start from scratch with the control and don't know if I need zero crossing detection or not or if I will need a opto-isolator or not. In my small mind this shouldn't take much of a circuit but my background isn't electronics, it's in control wiring. Could someone post a schematic or two on how to accomplish this control. Thank you.
BTW: Five amps is what will be needed and the train does operate on AC, reversing is done from within the train engine.
 

toppytop

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18vac

I have the schematic of the fan control I mentioned above. This is the type circuit I am looking for. Maybe this one can be modified to work with the lower secondary voltage.
 

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