They're made from the same basic stuff as most other bikes are made of, no difference there.
Railroad tracks are made from steel.
Bmx tracks are made of mostly lime and gravel
Concrete or asphalt depending on the track.
by a snowmobile
No, braces are not literally made out of train tracks, it's just the name given to the style.
A dinosaur similar to Dilophosaurus probably made the tracks. Until scientists know find remains that match the footprints perfectly, the dinosaur that made the tracks is referred to as Eubrontes.
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Trains run on tracks. The tracks are made up of a pair of parallel rails.
There is no free, legal source for backing tracks, but you can have backing tracks custom made from many producers at a reasonable fee.
Its an aesthetic reason. Most tracks are red because older tracks (before man-made surfaces) were red cinders.
Options for song backing tracks include purchasing pre-made tracks online, hiring a musician to create custom tracks, using software to create your own tracks, or using karaoke versions of songs.