I'm always hesitant to give values without seeing the items, because
condition is everything, but $100 is a fair starting point, value-wise,
for a 333 with tender and three 234 passenger cars, assuming they're in
fairly good shape. Adjust down if there are missing parts (wheels,
couplers and siderods are the most common missing parts I see); adjust
upward if the locomotive runs and everything's in really nice shape.
My wife surprised me with some trains she got at a yard sale today.
Funny how that happens sometimes. She couldn't call me to ask about
them so she kept saying as I was looking at them that she hoped she did
OK. She didn't get the deal of the century or anything, and the stuff
she got needs a lot of TLC, but she did a lot better than OK.