Close...there is 30 pound (old days), 60 pound, and 115 pound.
When I worked for UP/BNSF we used 136 pound rail, and of course CWR or Continuously Welded Rail, which was using the Thermite Welding process. It uses chemical heat of magnesium to make aluminum powder and other metals carbon-loving, to bring in the steel into the gap and fill it.
As for ties: I have seen them all. Plastic, wood, steel, concrete and composite. Wood always worked the best. Steel the worst. Concrete okay, but got destroyed during derailments.
A perfect wheel, on perfect rail means the wheel and top of the rail has contact 1/2 an inch wide. The contact between the flange and inside of the rail in perfect conditions (new rail, and new wheel) is .175 of an inch...or just a little more than 1/8th of an inch. In other words, there is not a lot of contact. I thought of that sometimes, sitting on a high railer (pick up with rail wheels) at a 60 mph switch with a 15,000 ton trail barreling headlong at me and only .175 of an inch holding it all to the rail as it shifted from my track to the other track!