Junior posted:
I will have 29 Red/Green LEDs as switch indicators and another 10 or so Blue LEDs as block power indicators. So I will have quite a few.
...
29 
Presumably you're still using the incandescent switch lanterns. Say ~1 Watt each so 30 Watts. Then control-panel LEDs at 20 mA from 18V DC is ~10 Watts (=29 x 18V x 20 mA). So 40 Watts just for lighting...or almost half the power of a typical 90W laptop charger.
My concern is the ability of the DC charger to put out the brief pulse needed to drive the solenoid coil. Previously discussed was peak vs. average power handling of semiconductors (LED) vs. coils (solenoids). The flip side is peak vs. average power sourcing of semiconductor power supplies (like a laptop charger) vs. iron/steel coils (AC transformer). While it depends on specific components involved, there's an argument that a "bare-fisted" transformer ought to be able to handle a short-term surge better than an electronic DC charger circuit.
A compromise alternative might be a fixed AC output adapter/wall-wart going into your bridge-rectifier (using the full-bridge).
I suppose some experimentation is in order with a DC output charger. Sustaining the short pulse to drive a switch machine may be all in a day's work.
