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So a few months back I bought a custom Walthers HO SW1 dressed like PM #11. Its an older one and it still needs work. However after looking at pictures of #11, before the roundhouse collapse she wore an M3 on the cab, dual beam headlights and had the stack extension installed by the PM. When did she receive these modifications? After the roundhouse roof collapse she was restored back to her as built configuration minus the stack extension. Where was/is the horn on PM #11 now and what type is it? The M3 is gone and no signs of the horn being mounted on the cab exist anymore. When were the single beam headlights replaced and when was the stack extension installed?

The stack extension was applied pretty early in its career- likely before the end of WWII, and definitely by the time that it got its blue paint job before 1950. Not many photos show the SW1s and early NW2s in service on the PM without stack extensions.

The handrails along the full length of the sides were applied in the 1960s (likely when it was repainted into the simplified C&O livery and renumbered to 8401 in 1966). It kept its original headlight housings until they were replaced with the twin sealed-beam headlights about the time that it got its Chessie paint job in the early 1970s.

#10 was retired in 1964 without as many modifications- it was still in its original paint and had only received the stack extensions and spark arrestors.

fmilhaupt wrote:The stack extension was applied pretty early in its career- likely before the end of WWII, and definitely by the time that it got its blue paint job before 1950. Not many photos show the SW1s and early NW2s in service on the PM without stack extensions.

The handrails along the full length of the sides were applied in the 1960s (likely when it was repainted into the simplified C&O livery and renumbered to 8401 in 1966). It kept its original headlight housings until they were replaced with the twin sealed-beam headlights about the time that it got its Chessie paint job in the early 1970s.

#10 was retired in 1964 without as many modifications- it was still in its original paint and had only received the stack extensions and spark arrestors.

Any clue when the horn was moved/changed?

I'd guess that the horn was changed in the mid-1960s when it got its simplified blue C&O paint job. That particular horn seems to have been popular on the locomotives assigned to Ontario, and at the time of the repainting into C&O blue, it was assigned to work the chemical plants at Sarnia.

Kevin Holland's photo book on the C&O in Ontario has a picture showing #8401 getting its Chessie paint in the St. Thomas shop in November, 1981, so it appears that #11 remained in blue paint longer than I'd thought.