http://magaimg.net/img/1mf0.jpg

The Railway Sleeper Opportunity Rover Sol 115.

http://magaimg.net/img/9top.jpg

Similar Sleeper, Curiosity Sol 1281.

http://magaimg.net/img/5ymo.jpg

'Nother One Curiosity Sol 1286.

http://magaimg.net/img/9tp4.jpg

Light Rail Tracks, Curiosity 1286.

http://magaimg.net/img/9tpa.jpg

Manufactured Object, Op 1319.

http://magaimg.net/img/9tpe.jpg

Rounded Object & Skulls, Op 1935.

http://magaimg.net/img/usb.jpg

Mystery Humps, Op 1074.

http://magaimg.net/img/9tpi.jpg

The Coin, Spirit 1220.

http://magaimg.net/img/9tpl.jpg

The Sheep's Head, PIA16453.

http://magaimg.net/img/9tpm.jpg

Spherical Concretions, Curiosity Sol 746.

http://magaimg.net/img/9tpq.jpg

Metal Ring, Op PanCam Sol 3567.

http://magaimg.net/img/9tpy.jpg

Hexagonal Object, Op Sol 4327.

http://magaimg.net/img/9tq6.jpg

Manufactured Object, Spirit 1312.

http://magaimg.net/img/9tqa.jpg

Unnatural Oblong Shape, Spirit 1312.

http://magaimg.net/img/9tqe.jpg

Roofing Iron, Curiosity Sol 1035.

http://magaimg.net/img/9tqf.jpg

Advanced Engineering, Op Sol 4689.

http://magaimg.net/img/9tqk.jpg

NA Style Plaque, Op Sol 4338.

http://magaimg.net/img/9tqo.jpg

Brickwork, Curiosity 1514.

http://magaimg.net/img/9tqt.jpg

More Brickwork, Opportunity 4756.

http://magaimg.net/img/9tr3.jpg

Machine Cut Stone, C 1073.

http://magaimg.net/img/9tr4.jpg

Box Section Steel, C 1073.

http://magaimg.net/img/9tr6.jpg

The Gun, Op Sol 3776.

http://magaimg.net/img/9tra.jpg

Earthworks Resemble Hydro Power Plant, C Sol 953.

http://magaimg.net/img/9tzx.png

Another anomaly associated with Opportunity Sol 115, is why the "bright spot" which would normally be associated with Solar reflection or a lens gremlin appears in the same spot in successive frames .. that the Rover ran over the railway sleeper without taking a closer look makes a mockery of the entire mission. Edit.