Cars must be attached to the back of the locomotive to produce, so yes, the right side. Touching is not sufficient.
Trains seem to work better that way : )
Yes, when you go to add a car, it highlights the appropriate squares. If you don't put it there, no bonus. No alternate set ups with this one, it has to be a proper train.Does anyone know if the cars have to be attached to the right side, so that it looks "normal", or is merely touching and adjacent sufficient?