What Is a Safety Wire?

Catch siding is the end line or station line to prevent locomotives, vehicles or trains from entering the route prepared for other trains. It is a partition device. When a railway line intersects in a plane within a section, and a branch line connects with a main line and an arrival and departure line in a section or station, a safety line should be provided. A safety line should be set at the end of the main line or the direction of pick-up to the departure line outside the stop signal at the station and within the braking distance range when the downhill gradient exceeds 6 . Its effective length is generally not less than 50m. ^[1]

A safety facility (catch siding) is a line facility provided to prevent trains from entering another route and causing conflicts with other trains or locomotives. Is the way

Catch siding is a line facility provided to prevent a train from rushing into another road and conflict with other trains or locomotives. It is one of the road separation equipment, and its effective length is not less than 50m. The following places should be provided with safety lines. The industrial enterprise line and the branch line meet the main line in the section. The industrial enterprise line and the branch line are connected with the main line or the arrival and departure line in the station. If the connecting place is restricted by the terrain conditions, or the road is flat or uphill towards the station, a derailment device or a turnout inside the derailment station can be installed instead of the safety line. However, be careful at the bridgehead and the denser buildings, because Derailment of vehicles will cause significant losses. If the industrial enterprise line and the branch line are connected with the station's arrival and departure line, and there is a parallel access in the station, and there are separate turnouts and interlocking devices, the safety line may not be provided. When the down-slope of the stop signal outside the stop is more than 6 , in order to meet the needs of simultaneous pick-up in both directions and trains in the same direction, a safety line should be set at the end of the pick-up direction. This prevents trains coming downhill from colliding with other trains.

1.White dotted line

When drawn on a road segment, it is used to separate the traffic flow in the same direction or as a safety distance identification line; when drawn on an intersection, it is used to guide the vehicle.

2.White solid line

When drawing in a road segment, it is used to separate motor vehicles and non-motor vehicles traveling in the same direction, or to indicate the edge of a roadway. When drawing in an intersection, it can be used as a guide lane line or a stop line.

3.Yellow dotted line

When painted on a road segment, it is used to separate the opposite traffic flow; when painted on a road side or on a rock, it is used to prohibit vehicles from parking on the roadside for a long time.

4.Yellow solid line

When painted on a road section, it is used to separate the traffic flow on the opposite side; when painted on the side of the road or on a rock, it is used to prohibit vehicles from parking on the roadside for a long time or temporarily.

5.Double white dashed line

When drawing at an intersection, it is used as a deceleration yield line. When drawing at a section, it is used as a variable lane line where the driving direction changes with time.

6.Double yellow solid line

When drawing in a road segment, it is used to separate the opposite traffic flow.

7.Yellow dotted line

When drawing in a road segment, it is used to separate the opposite traffic flow; the side of the yellow solid line is forbidden to overtake, span or turn, and the side of the yellow dashed line is allowed to pass, pass or turn under the condition of safety.

8.Double white solid line

When drawing at an intersection, it is used as a parking yield line.

The safety line is mainly laid on the road surface, withstands sun, rain, snow and ice, and is subject to the impact wear of vehicles. Therefore, its performance is strictly required. First of all, it requires short drying time and simple operation to reduce traffic interference. Secondly, it requires strong reflection ability, bright colors and strong reflectivity, so that it has good visibility during the day and night. Third, it should have anti-sliding and wear resistance. To ensure driving safety and service life.

Security lines are also sometimes referred to as security codes embedded in banknotes.

During the papermaking process, special polyester-based plastic threads, micro-safety threads or fluorescent threads are embedded in specific positions on the paper. Observation of the light reveals that a complete or windowed line is buried in the paper base. There are generally four types of security lines: full-line security lines, holographic security lines, optical variable security lines, and dynamic security lines. The shape of the line is generally a straight line, and it can also be made into a wave shape, a zigzag shape, or the like. The window-type security thread is intermittently exposed on the paper surface. When copying with a copier, the exposed security thread is copied into an intermittent black line, so it cannot be copied. The security line can be designed in various colors, and can also be on the same line with two color intervals, and there can also be micro-text on the line. In the new US 100-dollar bill paper in 1996, a polymer security thread showed pink fluorescence under ultraviolet radiation, and there were continuously printed micro-text "USA100". The thermal security thread is a pink thread at room temperature. When it is heated to 37 ° C with a finger, micro-text appears on the part. The laser safety line can not only change the color, but also the image. A metal or magnetic safety wire can be signaled or sounded with a corresponding detector. China s fifth set of security lines on the right side of the 2015 version of RMB 100, using light-transformed open-window security lines, can also see the text RMB100