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Amtrak
Charley
L
Trojan horse
VC
Vietcong
abstruse
agreement to disagree
alienated
alienation
alternative
antiestablishment
apostasy
at odds with
at rest
at variance with
avant-garde
back door
back stairs
back way
back-door
backstairs
baggage train
beclouded
behind the curtain
behind the scenes
behind the veil
blind
bolt-hole
branch
breakaway
buried
bushfighter
bushwhacker
cable railroad
cable railway
casual
choo-choo
clandestine
close
clouded
cog railroad
cog railway
collaborationist
collaborator
concealed
counter-culture
covered
covert
covert way
covertly
crypto
deep-buried
difference
differing
disaccord
disagreeing
disagreement
disapprobation
disapproval
disparity
dissatisfaction
dissension
dissent
dissentience
dissentient
dissenting
dissidence
dissident
diversity
dropping out
eclipsed
el
electric
electric railway
electric train
elevated
elevated railway
embankment
escalier derobe
escape hatch
escape route
experimental
express
express train
extremists
feeder
feeder line
feline
fellow traveler
fifth column
fifth columnist
flier
fraternizer
freight
freight train
freighter
funicular
furtive
goods train
gravity-operated railway
guerillas
guerrilla
hid
hidden
hidlings
hole-and-corner
horse railway
hugger-mugger
in a cloud
in a corner
in a fog
in a whisper
in darkness
in eclipse
in hidlings
in opposition
in purdah
in secret
in the background
in the dark
in the wings
incommunicado
insurgents
insurrectionists
interurban
irregular
junction
latent
light railroad
lightning express
limited
line
local
main line
maquis
maquisard
metro
milk train
minority opinion
monorail
mysterious
nobody the wiser
nonagreement
nonassent
nonconcurrence
nonconforming
nonconformist
nonconformity
nonconsent
obfuscated
obscure
obscured
occult
opposing
opposition
parliamentary
parliamentary train
partisan
passenger train
private
privy
quiet
rack railway
rack-and-pinion railroad
rack-and-pinion railway
radical
rail
rail line
railroad
railroad train
railway
rattler
recondite
recusance
recusancy
recusant
rejection
repudiation
resistance
resistance fighter
resting in peace
revolutionary
roadbed
roadway
rolling stock
saboteur
secession
secluded
secluse
secret
secret exit
secret passage
secret staircase
secretly
sectarian
sectary
security risk
sequestered
shifty
shuttle
shuttle train
side door
sidetrack
siding
skulking
slinking
slinky
sly
sneaking
sneaky
sotto voce
special
stealthy
streamliner
street railway
streetcar line
sub rosa
subterranean
subterraneous
subversive
subversives
subway
sunken
surreptitious
switchback
terminal
terminus
track
train
tram
tramline
trestle
trolley line
trunk
trunk line
tube
turnout
under an eclipse
under cover
under house arrest
under the breath
under the rose
under wraps
under-the-counter
under-the-table
undercover
underfoot
underground fighter
underground railroad
underground route
underhand
underhanded
unknown
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