Paul Kallus posted:...
Does the Z-1000 have accessory terminals? If there's power to spare, I'd like to use it to power the houses, too.
Yup. 14V AC.
As for 100W being "adequate", someone correct me if I'm mistaken but I believe MTH shipped Z-500 or Z-750 (50/75 Watt) transformers with their "starter sets" that had a twin-motor diesels and several load cars. So if all you have is an "unloaded" trolley, I think you'll be able to light up some houses/buildings and then some!