Would anyone be interested in the "Photography Game" here?

[doctorwayne]

That one's probably used for a small crane, like this:



...but idlers are also used to accommodate oversize loads, such as this:



...or to allow a locomotive to switch areas from which it would be restricted due to weight or clearance issues. Here, it's clearance, but on a carfloat, it would likely be on account of the weight:



Wayne