Just received the Vision-Sided reefer cars. Three cars in the set but unlike the vision tanker cars only one has a sound system.
I wondered with the tankers why offer the extra soundless car with the set. Of which I have no answer other than marketing.
If the three cars shared speakers or were interconnected so the sound moved across the three cars then I see it. But what I have is two extra(and really nicely detailed UP Pacific Fruit Express Reefer) cars that I did not need to pay for.
ahhhh marketing!