...And look out for the little star on the ceiling, that indicates the floor hatch for lifting Negative shoes.
They vary from stock to stock, I could probably still recall every single 1959 Stock acronym as these were drummed into us parrot fashion in the olden days of 'going up for Motors'. I ought to know all the C and D stock ones too.
Those ending in '-COS' = 'Cut out switch'
e.g. ComCOS = Compressor cut out switch
TCOS = Traction cut out switch
'-IC' = 'Isolating cock'
e.g. MLIC = Mainline isolating cock
DIC = Door isolating cock
Others off the top of my head: BRV = Brake release valve, EL = Emergency ladder, IS = Ice scraper