I did a few posts here concerning Central City and Silver Plume and the 40 and 44....But I'm too lazy to search for them.
#44 came to Central City in 1968 and worrked there until 1975 when she went to Silver Plume. She stayed there until 2004 and went into hiding. She is in pieces and most parts are at the CRRM.
#40 came to Central City in 1973 and worked there until about 1977 (?) when she to came to the Loop. She went to the White Pass for a while and then returned to the Loop.
In 2004 she aslo went to the CRRM and is still there. Both are currently for sale
Jerry