Underground Railroad
Underground Railway | secret aid to escaping slaves that was provided by abolitionists in the years before the American Civil War |
quarterback
signal caller
field general | (American football) the position of the football player in the backfield who directs the offensive play of his team, quarterback is the most important position on the team |
signals intelligence
SIGINT | intelligence information gathered from communications intelligence or electronics intelligence or telemetry intelligence |
cable railway
funicular
funicular railway | a railway up the side of a mountain pulled by a moving cable and having counterbalancing ascending and descending cars |
car railcar
railway car
railroad car | a wheeled vehicle adapted to the rails of railroad, three cars had jumped the rails |
cog railway
rack railway | railway for steep mountains, a cogwheel on the locomotive engages cogs on a center rail to provide traction |
elevated railway
elevated railroad
elevated
el
overhead railway | a railway that is powered by electricity and that runs on a track that is raised above the street level |
line railway line
rail line | the road consisting of railroad track and roadbed |
locomotive
engine locomotive engine
railway locomotive | a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks |
railroad track
railroad railway | a line of track providing a runway for wheels, he walked along the railroad track |
railway
railroad
railroad line
railway line railway system | line that is the commercial organization responsible for operating a system of transportation for trains that pull passengers or freight |
| railway junction | a junction where two or more railway lines meet or cross |
railway station
railroad station
railroad terminal
train station
train depot | terminal where trains load or unload passengers or goods |
| scenic railway | small railway in an amusement park |
signal box
signal tower | a building from which signals are sent to control the movements of railway trains |
yard railway yard
railyard | an area having a network of railway tracks and sidings for storage and maintenance of cars and engines |
| signal level | the amplitude level of the desired signal |
signal detection
detection | the detection that a signal is being received |
signal
signaling
sign | any nonverbal action or gesture that encodes a message, signals from the boat suddenly stopped |
starting signal
start | a signal to begin (as in a race), the starting signal was a green light, the runners awaited the start |
| storm signal | a signal announcing the approach of a storm (particularly a storm of marked violence) |
| time signal | a signal (especially electronic or by radio) indicating the precisely correct time |
alarm
alert warning signal
alarum | an automatic signal (usually a sound) warning of danger |
distress signal
distress call | an internationally recognized signal sent out by a ship or plane indicating that help is needed |
reveille
wake-up signal | (military) signal to wake up |
telegraphic signal
radiotelegraphic signal | a signal transmitted by telegraphy |
| visual signal | a signal that involves visual communication |
traffic light
traffic signal
stoplight | a visual signal to control the flow of traffic at intersections |
flag
signal flag | a rectangular piece of fabric used as a signalling device |
code flag
nautical signal flag | one of an international code of flag signals used between ships |
blinker
turn signal
turn indicator
trafficator | a blinking light on a motor vehicle that indicates the direction in which the vehicle is about to turn |
| electronic signal | a signal generated by electronic means |
signal fire
signal light | a fire set as a signal |
input signal
input | signal going into an electronic system |
output signal
output | signal that comes out of an electronic system |
background
background signal | extraneous signals that can be confused with the phenomenon to be observed or measured, they got a bad connection and could hardly hear one another over the background signals |
| signal | any incitement to action, he awaited the signal to start, the victory was a signal for wild celebration |
quarterback
signal caller
field general | (football) the person who plays quarterback |
trainman
railroader
railroad man
railwayman
railway man | an employee of a railroad |
| signal | an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes |
| radio signal | a radio wave used to transmit and receive messages |
signal-to-noise ratio
signal-to-noise
signal
noise ratio
signal
noise
S
N | the ratio of signal intensity to noise intensity |
| bespeak betoken indicate point signal | be a signal for or a symptom of, These symptoms indicate a serious illness, Her behavior points to a severe neurosis, The economic indicators signal that the euro is undervalued |
sign signal
signalize signalise | communicate silently and non-verbally by signals or signs, He signed his disapproval with a dismissive hand gesture, The diner signaled the waiters to bring the menu |
| signal | notably out of the ordinary, the year saw one signal triumph for the Labour party |