Condensed Profile of the D&RGW RR dated January 1, 1955 indicates rail record as follows:
Salida to Gunnison:
MP 215.86 (end of 3rd rail) to MP 221.73 85# rail placed 1937 & 1939
MP 221.73 to MP 235.00 70# rail placed 1923
MP 235.00 to MP 238.00 90# rail placed 1948
MP 238.00 to MP 262.00 85# rail placed 1936, 1937, 1939, & 1940
MP 262.00 to MP 287.84 (Gunnison) 65# rail placed 1897 & 1898
Crested Butte Branch
MP 288.79 to MP 306.13 65# rail placed 1904
MP 306.13 to MP 315.21 85# rail (second hand) placed 1946
MP 315.21 to MP 316.00 90# rail (second hand) placed 1946
MP 316.00 to MP 316.05 65# rail placed 1904
MP 316.05 to MP 316.79 65# rail placed 1914
Hope this helps a little
Jimmy