Objects in the image:
category: train
category: traffic light
category: traffic light

Guessing-game dialogue about one of the objects:
q: is it public transport?
a: No
q: is it in contact with the ground?
a: No
q: is it in the sky?
a: No
q: does it have the capability to change colour?
a: Yes
q: is it hanging above the train?
a: No
q: when it changes colour, is it to white light?
a: No
q: is it placed next to the train?
a: Yes