At what speed do you pass a double yellow aspect
At what speed do you pass a double yellow aspect
At what speed do you pass a double yellow aspect
Picture it. Ambling along at 125 mph, passing green signal after green signal, when we come upon a double yellow. At this stage, of course, we don’t know what the next signal is likely to be so how would a real life driver approach this so far as speeds are concerned.
Assume, then, that the next signal is, in fact, a single single yellow. Same question, what speeds woud you use when passing this, also?
I believe drivers are taught to act defensively and expect the worst. So as the signal aspects denote:
At double yellow, expect a single yellow.
At a single yellow, expect a red.
I follow a similar pattern as above but instead of fractions I use percentage. At a double yellow I reduce my speed by 50%. At a single I reduce my speed 50% again. That way its proportional rather than absolute.
However, route knowledge is also key, as with the ‘quarter line speed’ rule above, you could be approaching a possible red at 30mph round a blind bend. Line of sight might not allow a gentle stop from that speed. So knowing where signals will be becomes important.
You’re right Luca; I was keeping it simple.
Sometimes halving your speed (rather than the linespeed) would be unnecessary too. For example a failed horn and you’re restricted to and travelling at 20mph. If you’re in a 90 section it wouldn’t be ‘optimal’ to further reduce your speed to 10mph at a double yellow.
Route knowledge IS key, as you say.
How to avoid spad in railway?
Asked by: Fermin Koss
Keep a sharp look out for correct signals pertaining to your line. Avoid over speeding & over condence. Reduce speed proportionately in case signal aspect is restrictive.
What causes a SPAD?
A signal is passed at danger (SPAD) when a train passes a stop signal when not allowed to do so. A signal is passed at danger (SPAD) when a train passes a stop signal when not allowed to do so.
What is a SPAD indicator?
A signal passed at danger (S.P.A.D.), known in the United States as a stop signal overrun and in Canada as passing a stop signal, is an event on a railway where a train passes a stop signal without authority.
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At the apex level of the Ministry of Railways, Member Staff is the highest level post, who is ex-officio Secretary to Government of India.
Is govt going to privatize railway?
How to avoid SPAD in railway #IndianRailway #SPAD #SignalPassAtDanger
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How do you prevent SPAD?
Reduce speed proportionately in case signal aspect is restrictive. Loco pilot should stop the train at adequate distance before the foot of signal when it is at “ON”, so as to have clear view of signal from cab, subject to clearing of fouling mark.
What is a multi SPAD signal?
What does AWS stand for train?
TPWS (Train Protection and Warning System) and AWS (Automatic Warning System).
How does a SPAD work?
At what speed do you pass a green aspect?
Flashing green – flashing green aspects are employed on the East Coast Main Line north of Peterborough. They were installed for 140 mph (225 km/h) running in connection with the testing of the new InterCity 225 electric trains, with a steady green limiting test trains to the normal speed limit of 125 mph (200 km/h).
At what speed do you pass a yellow aspect?
The next aspect will always be yellow unless it changes as more of the train’s route is clear. An unofficial advised speed past this signal is 70-80.
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Meet the eligibility criteria.
Educational criteria: For most Indian Railways recruitment exams, having a graduation/ bachelor degree is the basic eligibility criteria. Each candidate must possess a bachelor degree from a recognized university. Age requirements: Age is another restriction for gaining railway jobs.
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As per 7th pay Commission an IAS officer gets Rs 56,100 rupees basic salary. Apart from this these officers get many allowances including travel allowance and dearness allowance. As per information an IAS officer gets around more than one lakh rupees as salary every month including the basic salary and allowances.
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Spanning 4273 km on rail tracks, and a running time of 80 hours and 15 minutes and about 55 scheduled stops, the Vivek Express covers the longest train route in India. It joins Dibrugarh (DBRG) in Assam, North-East India to Kanyakumari (CAPE), Tamil Nadu which is the southernmost tip of mainland India.
At what speed do you pass a double yellow aspect
Picture it. Ambling along at 125 mph, passing green signal after green signal, when we come upon a double yellow. At this stage, of course, we don’t know what the next signal is likely to be so how would a real life driver approach this so far as speeds are concerned.
Assume, then, that the next signal is, in fact, a single single yellow. Same question, what speeds woud you use when passing this, also?
I believe drivers are taught to act defensively and expect the worst. So as the signal aspects denote:
At double yellow, expect a single yellow.
At a single yellow, expect a red.
I follow a similar pattern as above but instead of fractions I use percentage. At a double yellow I reduce my speed by 50%. At a single I reduce my speed 50% again. That way its proportional rather than absolute.
However, route knowledge is also key, as with the ‘quarter line speed’ rule above, you could be approaching a possible red at 30mph round a blind bend. Line of sight might not allow a gentle stop from that speed. So knowing where signals will be becomes important.
You’re right Luca; I was keeping it simple.
Sometimes halving your speed (rather than the linespeed) would be unnecessary too. For example a failed horn and you’re restricted to and travelling at 20mph. If you’re in a 90 section it wouldn’t be ‘optimal’ to further reduce your speed to 10mph at a double yellow.
Route knowledge IS key, as you say.
Signal
Signal
A signal is an indicator that through a displayed indication, conveys the status of the track ahead to Drivers passing it. This could be a signal, with 3 or 4 lights mounted on a pole or shunt signals near the ground producing a white and red pattern.
Contents
Mechanics
Signals work by using sensors mounted on the track to check if a train is present. The sensor in question will then report its status to a signalling centre and will change the signal aspects behind it to tell Drivers that they need to slow down and stop as their route cannot be set due to a conflicting move or train in front.
Signal meanings
A green aspect ( Proceed ) tells the driver that their route is clear and that they can proceed at line speed. The next aspect is usually green but can sometimes be (double) yellow. If this signal is shown, it will trigger an electrical ping from the AWS. This ping does not have to be acknowledged and is there to alert the driver.
A double yellow aspect ( Preliminary Caution ) tells the driver that their route is not clear after two signals ahead and they must slow down in preparation to stop at the red signal. The next aspect will always be yellow unless it changes as more of the train’s route is clear. If this signal is next it will trigger an AWS sound in the form of a loud continuous beep and must be acknowledged by the driver by pressing Q or by clicking the warning symbol.
A yellow aspect ( Caution ) tells the driver that the next signal can be red ( Danger ) and that they must slow down in preparation to stop at the next signal. The next aspect will be red ( Danger ) unless it changes as more the train’s route is clear or the Signaller sets the signal to caution. The speed limit on SCR past this aspect is 45 mph until the signal aspect clears to a less restrictive aspect. However, it is found in some places to designate a speed limit decrease to 45 mph. If this signal is next it will trigger an AWS horn in the form of a loud continuous beep and must be acknowledged by the driver by pressing Q or by clicking the warning symbol.
A red aspect ( Danger ) tells the driver that they must stop at this signal and they must come to a complete stop by the signal. They must not proceed past this signal and if they do, automatic emergency braking is applied and will bring the train to a halt. The term for passing this signal is Signal Passed at Danger (SPAD). The train has no clearance beyond this point. If this signal is next it will trigger an AWS horn in the form of a loud continuous beep and must be acknowledged by the driver by pressing Q or by clicking the warning symbol.
Shunt signals
This type of signal is found in most depots and sidings. It is mounted to the ground unlike regular signals. It has three lights in a triangular shape and two white lights mean proceed at caution whereas any other indication should be taken as a stop signal or a malfunction.
Shunt signal meanings
A double red aspect ( Danger ) tells the driver that they must stop at this signal and they must come to a complete stop by the signal. They may not proceed past this signal and if they do, automatic emergency braking is applied and will bring the train to a halt. The term for passing this signal is Signal Passed at Danger (SPAD). The train has no clearance beyond this point. If this signal is next it will trigger an AWS horn in the form of a loud continuous beep and must be acknowledged by the driver by pressing Q or by clicking the warning symbol.
Indicators
There are two types of signal indicators: Feather and Alphanumeric. Both types are purely cosmetic and Drivers are not required to make any additional input.
Signal A126 with an illuminated right feather indicator at the Morganstown triangle, showing the route that the train will take
Feather Indicator
A feather signal is a type of signal that has one or two rows of white lights (called feathers) mounted above the aspect lights. When appropriate, they illuminate to indicate the direction of divergence.
Feather signals are triggered upon passing the signal prior as only then can the route be detected. As a result, Signallers have no control over setting feathers before a train approaches a signal.
These indicators were added as part of the 1.9.0 update and are found at most junctions.
Signal S564 displaying ‘0’ on the approach to Llyn-by-the-Sea, indicating Platform 0
Alphanumeric Route Indicator
Alphanumeric route indicators (also known as theatre-style) are similar to feather indicators, but instead of rows of white lights indicating direction of divergence, a screen mounted on top of the aspect lights displays a letter or number, indicating the assigned route or platform.
Likewise with feathered signals, they were teased during BanTech’s livestream on 6 January 2022.
These indicators were added as part of the 1.9.1 update and are commonly found upon approach of a major station.
Locations
The train now approaching Platform 4 terminates here!
This section contains insufficient information and is considered a stub. You can assist this wiki by expanding it as much as you can.
The train now approaching Platform 4 terminates here!
This section contains insufficient information and is considered a stub. You can assist this wiki by expanding it as much as you can.
At what speed do you pass a double yellow aspect
Picture it. Ambling along at 125 mph, passing green signal after green signal, when we come upon a double yellow. At this stage, of course, we don’t know what the next signal is likely to be so how would a real life driver approach this so far as speeds are concerned.
Assume, then, that the next signal is, in fact, a single single yellow. Same question, what speeds woud you use when passing this, also?
I believe drivers are taught to act defensively and expect the worst. So as the signal aspects denote:
At double yellow, expect a single yellow.
At a single yellow, expect a red.
I follow a similar pattern as above but instead of fractions I use percentage. At a double yellow I reduce my speed by 50%. At a single I reduce my speed 50% again. That way its proportional rather than absolute.
However, route knowledge is also key, as with the ‘quarter line speed’ rule above, you could be approaching a possible red at 30mph round a blind bend. Line of sight might not allow a gentle stop from that speed. So knowing where signals will be becomes important.
You’re right Luca; I was keeping it simple.
Sometimes halving your speed (rather than the linespeed) would be unnecessary too. For example a failed horn and you’re restricted to and travelling at 20mph. If you’re in a 90 section it wouldn’t be ‘optimal’ to further reduce your speed to 10mph at a double yellow.
Route knowledge IS key, as you say.