With so little surviving of the trainmasters, It's extremely difficult to find anything relating to them. I came across two operators manuals, one for the H24-66 Trainmaster itself and its carbody cousin, the C-Liner. I encourage all of you to check these out.
H24-66:
http://www.rpca.com/pdfs/FMtrainmasteroperatormanual.pdf
C-Liner:
http://www.canadasouthern.com/caso/images/operating-instructions-1949.pdf