signal aspects Flashcards
(60 cards)
in three position signals, what does 2 reds mean
STOP
in three position signals, what does yellow over red mean
normal speed warning
in three position signals, what does green over red mean
clear normal speed, green over red is clear up ahead
in three position signals, what does yellow over green mean
reduce to medium
in three position signals, what does red over yellow` mean
medium speed warning
in three position signals, what does red over green mean
clear medium speed
in three position signals, what does 2 reds with a yellow C light mean
low speed caution
in three position signals, what does a yellow or green A light mean
normal
in three position signals, what does a yellow or green B light mean
medium
in three position signals, what does a yellow dwarf signal mean
low speed caution, 15 kph
in three position signals, what does a green dwarf signal mean
clear low speed
in three position signals, what does a red, blue or purple dwarf signal mean
STOP
what is the PTSN for stop in 3 pos
red
may or may not be set
may or may not be occupied
stop
unknown
what is the PTSN for normal speed warning in 3 pos
yellow over red
set if any
clear
track speed, prepare to stop
next signal is at stop
what is the PTSN for clear normal speed in 3 pos
green over red
set if any
clear
track speed
proceed
what is the PTSN for reduce to medium in 3 pos
yellow over green
set if any
clear
track speed, 40 (medium) by next signal
medium aspect
what is the PTSN for medium speed warning in 3 pos
red over yellow
set if any
clear
40kph, prep to stop
stop
what is the PTSN for clear medium speed in 3 pos
red over green
set if any
clear
40 kph
proceed
what is the PTSN for low speed caution in 3 pos
red red yellow
set if any
may or may not be occupied
15 kph, prep to stop
unknown, most likely at stop
what is the PTSN for a dwarf at stop in 3 pos
red blue or purple
may or may not be set
may be occupied
stop
unknown
what is the PTSN for a dwarf at low speed caution in 3 pos
yellow
set if any
may be occupied
15 kph, prep to stop
unknown
what is the PTSN for a dwarf at clear low speed in 3 pos
green
set if any
clear
15 kph
proceed
what are the types and classes for 3 pos signals 4
light type
home
automatic
dwarf
what does a banner indicator in a horizontal position mean
red