One of the reasons WAP-7 "appeared" to have a better acceleration was because it was hauling LHB coaches which are a bit more aerodynamic in design and reduces drag than the ICF coaches. The WAP-4 did a good job in spite of hauling the ICF coaches. Overall I would dare say WAP-4 had a better acceleration.
@@somsubhraganguly7404You are right bro and I know that wap 7 has better specification than wap 4 but I was just telling that if they have the same coaches than it will be more fun to see how much fast wap 7 accelerate than wap 4
@@anandsriram1748 absolutely but it cannot pull rakes more than 19-20 at that speed. Hence it's used mostly for Shatabdi, Rajdhani short distances. Where there is N.F.S (Need For Speed).
though I am not an expert, but as a viewer, I can say that WAP7 has the feature to accelerate more quickly than WAP 4 and more quickly it can reduce its speed when required. WAP 4 is generally used for the trains where a train does not required to stop more number of stations. Prior to coming of WAP 7, in long distance trains, WAP 4 is used in Rajdhani, Shatabdi & some duronto trains also where stoppages are very less. Although technically WAP 7 is much more advanced features than WAP 4. WAP 4 does not have any HOG system which was enabled in WAP 7. So obviously WAP 7 has much more potential in terms of speed & acceleration. thanks for the video.
That makes sense. For top speed on speed limited tracks it probably doesn't matter if the train has 5050 or 6120 horsepower. For acceleration however it does matter. I guess the 22 coaches Amrit Bharat with 2*6000 hp will be the long distance trains that stop at every station.
WAP7 have the most potential (when compared to WAP4) but then it depends on the load. For equal number of coaches the LHBs exerts less drag. It also matters how much throttle being used in each case. It may be worth recording a WAP5 which is technically best suited for quick acceleration and used for hauling Shatabdi express. Nice video nevertheless.
Both WAP-7 and WAP-4 seemed to have same potential of acceleration in the video, but tractive power of WAP-7 is more than WAP-4. 👍🏻Superb Capture 🔥 and that "Uncle Uncle" part was really awesome 😂😂😂
Nice video. Considering equal and fair situations and conditions, I would say that WAP-7 will have best Acceleration. Let me explain.. The biggest impacting difference between WAP-4 and WAP-7 in this aspect is their throttle control system construction. The throttle of WAP-7 is very simple, a vertical handle with only 3 settings (0- initial position, 33%, 66%, 100%). 33% means 33% of traction power is applied. But in WAP-4, the throttle is set up like a tight steering wheel with 32 notches (32 levels) representing the rated loco power. Comparatively, the effort of applying power is very easy in WAP-7. A single notch (33%) is equivalent to 10 notches in WAP-4. Due to this, WAP-7 gets full power quickly than WAP-4, making it the best accelerator. Traction motor wise, WAP-7 has 6 3-phase induction motor with 850kw each, compared to 6 DC series motors of 630kw in WAP-4. Though the race was set up in fairly means considering the power of the respective locos, WAP-7 would still win. Thank you for the video.
The answer lies in simple science, which you were holding … all phones have stopwatch/timer app. You simply needed to time the loco departure and last carriage from where you were recording to decide which train with their respective locomotives, left the station the fastest to get a clear answer. Not to worry, try it next time as it will be an interesting exercise.
@@sapthagirin5404 Good point. In that case, there can only be a realistic test when all the stars align or as they say here in Australia: when all the ducks line up. Good luck and keep trying.
Hi pritam sir, is it illegal to shoot train videos in any railway station in India??? cause i was stopped to shoot video at one station in Karnataka, and i asked what's reason behind not allowing and he said it's not allowed here and he didn't even gave any valid reason so just wanted to clear that is it legal or illegal
The staff and RPF just mess with average citizens for no valid reason. Either they don't know the law and are paranoid, or just there to get a power trip out of interfering with others. Happens all over the country in all kinds of situations
wap 7 has the potiential to accelerate even faster but here wap 4 did the job well...dont underestimate the wap4...before the arrival of wap 7...wap 4 rule the express and superfast and even premium trains all over india...inspite of wap 7...still wap 4 doesnt get out of breathe...old is gold💪
Excellent video thanks for sharing such kind of video especially we railfans eagerly waiting acceleration, and effort you may require and you counter this that too appreciable
Wap 7 is superior no doubt but Wap 4 has been the most successful loco before that and carries lots of nostalgic values for us old timers!! Hence would hold both in high regard!! Before that Wap 1 and Wam 4 also had that esteemed value thus etched in our memory!! Pritam wonderful shoot as always and loved reading Anupam Anupam's comment as well!!
Wap4 has DC traction motors and DC motors always have advantages of speed control .Induction motors have poor speed control but singly excited more efficient motors. With the discovery of thyristors based frequency controllers in 90s they are able to control motor speeds comparable to DC motors and hence now 3 phase Induction motors are used everywhere for locomotives. Induction motors also do not require rectifiers for any AC DC conversion as required in DC motors since overhead lines are AC hence lowering costs. AC=alternating current DC=direct current.
This is what happens when you learn something at the surface and think that you're a know-it-all. All 3 phase AC locomotives like WAP-7 have rectifiers. First step down transformer is used to lower voltage, then this AC is rectified into DC. This DC is now converted to 3 phase AC using inverters (can be GTO, IGBT, etc.). SPWM control is used for speed control.
Wap7 has better acceleration because it was pulling LHB coaches so they capable to go 200 KM/h but restricted in 130 and wap4 was pulling ICF coaches so that only goes up to 110 KM/h
Bhai ! Wap 7 aar Wap 4 era dujunei acceleration bhalui dieche. Kalke amrao Surat teke Howrah junction obdi journey korlam ADI HWH SF Express e aar amra ei train e asi..aar amader train taake lead korechilo HWH Wap 4. Aar ei train ta ekhono ICF hi ache lhb hoeni.....
Actually one of the main factor is the driver. I remember, MMTS local train, in one trip same train never crosses 76 kmph, while on another day with a different driver, touched 96 kmph which was truly amazing. I feel, such slow drivers should be Demoted to shunting services if they cant even drive at permitted speed of 80-90 kmph
as far as i know, since ages, Gujarat Mail was the only non Rajdhani train (shatabdi and duronto are newer versions) to have 11 AC coaches . now this train has been allotted LHB rakes
i wanna add something as to why LHB coach Train is faster than older ICF coaches. normally locos do provide hotel power for the coaches to run the electric lights and fans etc but what when the loco is not connected ? or there is a cable connect issue between loco and coaches at some point along the train ? then what ? so as backup, ICF coaches have Self generation ie the motion of the coach wheels also drive the generators which also charge the batteries which then provide power to the lights and fans. in AC coaches, this is even more as the coaches has to generate much more energy to drive the AC coaches. All this ultimately makes the train heavier to move for the Loco . LHB have only locomotion, the wheels do not drive any type of generators as all electric power is provided by the EOG coaches using a separate diesel generator so they are effectively lighter for the loco as there is no drag from the generators. so LHB coaches are lighter and faster than ICF coaches irrespective of which loco is being used.
Wap 7 had LHB coaches which are light in weight one the other side wap 4 had to haul heavier ICF coaches so it were fair than both wap 7 and wap 4 should haul LHB co coaches or both should haul ICF coaches
I cannot forget the 1997 image of WAP4 hauling Rajdhani express. That locomotive brings back golden memories. Truly Nostalgic feeling
WAP 1 & WAP 4 both hauled Rajdhanis in early 2000s as well
One of the reasons WAP-7 "appeared" to have a better acceleration was because it was hauling LHB coaches which are a bit more aerodynamic in design and reduces drag than the ICF coaches. The WAP-4 did a good job in spite of hauling the ICF coaches. Overall I would dare say WAP-4 had a better acceleration.
I agree if they both have LHB coaches than only the competition will be equal and fair.
WAP 7 actually has better acceleration, irrespective of the coaches. You can see the technical specifications mentioned in Wikipedia.
@@somsubhraganguly7404You are right bro and I know that wap 7 has better specification than wap 4 but I was just telling that if they have the same coaches than it will be more fun to see how much fast wap 7 accelerate than wap 4
Wap5 is better than wap4 and wap7. Wap5 is used for high-speed trains like rajdhani duronto gatimaan etc
@@anandsriram1748 absolutely but it cannot pull rakes more than 19-20 at that speed. Hence it's used mostly for Shatabdi, Rajdhani short distances. Where there is N.F.S (Need For Speed).
I am Confused
Unable to Distinguish the acceleration between WAP-7 and WAP-4.
Anyways I enjoyed both 🔥🔥.
2:30 uncle-uncle 😂😂😂
Uncle turned away with superb acceleration. Rest all good!
though I am not an expert, but as a viewer, I can say that WAP7 has the feature to accelerate more quickly than WAP 4 and more quickly it can reduce its speed when required. WAP 4 is generally used for the trains where a train does not required to stop more number of stations. Prior to coming of WAP 7, in long distance trains, WAP 4 is used in Rajdhani, Shatabdi & some duronto trains also where stoppages are very less. Although technically WAP 7 is much more advanced features than WAP 4. WAP 4 does not have any HOG system which was enabled in WAP 7. So obviously WAP 7 has much more potential in terms of speed & acceleration. thanks for the video.
Right now in current situation, 95% of the premium trains including the Rajdhani's, Duronto's and Shatabdi uses WAP7 and not WAP4.
You are right
That makes sense. For top speed on speed limited tracks it probably doesn't matter if the train has 5050 or 6120 horsepower. For acceleration however it does matter.
I guess the 22 coaches Amrit Bharat with 2*6000 hp will be the long distance trains that stop at every station.
WAP7 have the most potential (when compared to WAP4) but then it depends on the load. For equal number of coaches the LHBs exerts less drag. It also matters how much throttle being used in each case.
It may be worth recording a WAP5 which is technically best suited for quick acceleration and used for hauling Shatabdi express.
Nice video nevertheless.
I'm stunned by the length of the trains and the acceleration as well.
Also I love the colors 👍❤
Star of the show- the random uncle stopping in front of the camera 😜
It's. Very dangerous to catch train on this platform ☠️☠️ because Accelerate like a open door metro 🔥😍
Acceleration depends on signals clearence and also loco pilots skills and confidence level
What about loco potential? P4 and p7 are not same
Fully Enjoyed 🤠 Both trains Wap4 & Wap7
Feel the track sound (Thak thak.... Thak thak...) 🙃
those who are saying about air drag....
the term aerodynamics comes in action when the speed of train is high i.e( accelerating above 80kmph)
Hmm. Ok. Then what about LHB being lighter and also ICF has alternators .. both matter right
Wap 7 as it is known as accleration king has probably accelerated very well but wap 4 also had a good acceleration ....
one of the best thing is that pritam das never fail to make us laugh by his content 😂😂😂 sab yahi likoge
WAP 4 has better acceleration. WAP 4 can pull more coaches than wap 5 or wap 7 and can go to more speed. WAP 4 is a real hero amd legend
4 is lion and 5,7 ate panthers
Both WAP-7 and WAP-4 seemed to have same potential of acceleration in the video, but tractive power of WAP-7 is more than WAP-4. 👍🏻Superb Capture 🔥 and that "Uncle Uncle" part was really awesome 😂😂😂
Apt reply.
Nice video. Considering equal and fair situations and conditions, I would say that WAP-7 will have best Acceleration. Let me explain..
The biggest impacting difference between WAP-4 and WAP-7 in this aspect is their throttle control system construction. The throttle of WAP-7 is very simple, a vertical handle with only 3 settings (0- initial position, 33%, 66%, 100%). 33% means 33% of traction power is applied. But in WAP-4, the throttle is set up like a tight steering wheel with 32 notches (32 levels) representing the rated loco power. Comparatively, the effort of applying power is very easy in WAP-7. A single notch (33%) is equivalent to 10 notches in WAP-4. Due to this, WAP-7 gets full power quickly than WAP-4, making it the best accelerator.
Traction motor wise, WAP-7 has 6 3-phase induction motor with 850kw each, compared to 6 DC series motors of 630kw in WAP-4. Though the race was set up in fairly means considering the power of the respective locos, WAP-7 would still win.
Thank you for the video.
Very well explained 😍
Sir absolutely wap7
The answer lies in simple science, which you were holding … all phones have stopwatch/timer app. You simply needed to time the loco departure and last carriage from where you were recording to decide which train with their respective locomotives, left the station the fastest to get a clear answer. Not to worry, try it next time as it will be an interesting exercise.
Abe chutiya vo acceleration dhika rha hai 😂😂😂
Length of LHB coach and ICF coach are different. LHB is way longer than ICF. So, 22 LHB coaches and 22 ICF coaches does not measure the same length.
@@sapthagirin5404 Good point. In that case, there can only be a realistic test when all the stars align or as they say here in Australia: when all the ducks line up. Good luck and keep trying.
Perception of acceleration is good enough for most viewers. Values are not needed. 😄
Most people here don't know the unit of acceleration, so it doesn't matter.
I think the 2nd one cheers bob.🍇🍒🍓🍌🍍🥭🥩🥞🥚🦐🍨🍩😁
Hi pritam sir, is it illegal to shoot train videos in any railway station in India??? cause i was stopped to shoot video at one station in Karnataka, and i asked what's reason behind not allowing and he said it's not allowed here and he didn't even gave any valid reason so just wanted to clear that is it legal or illegal
Legal hai. In 2018 govt clarified if it is not for film or monetary value it is allowed.
The staff and RPF just mess with average citizens for no valid reason. Either they don't know the law and are paranoid, or just there to get a power trip out of interfering with others. Happens all over the country in all kinds of situations
@@yash.kapoor yes exactl
@@barun9665 oh thanks for clarifying 😍
@@yash.kapoor True🙂
wap 7 has the potiential to accelerate even faster but here wap 4 did the job well...dont underestimate the wap4...before the arrival of wap 7...wap 4 rule the express and superfast and even premium trains all over india...inspite of wap 7...still wap 4 doesnt get out of breathe...old is gold💪
Pritam makes best thumbnails 😂
Both Acceleration was Great But I think Wap 4 was just fast not more only Just But Nice by Wap 7 as well 😀😀😀😀😀❤️❤️😀😀❤️❤️😀😀😀❤️❤️❤️😀😀
Excellent video thanks for sharing such kind of video especially we railfans eagerly waiting acceleration, and effort you may require and you counter this that too appreciable
No need of vande Bharat..these wap 7s are enough for a good acceleration...
Bahut badhiya acchi expectation and speed👌👌👌👌
177👍
Awesome😍👍
Wap 7 is superior no doubt but Wap 4 has been the most successful loco before that and carries lots of nostalgic values for us old timers!! Hence would hold both in high regard!!
Before that Wap 1 and Wam 4 also had that esteemed value thus etched in our memory!!
Pritam wonderful shoot as always and loved reading Anupam Anupam's comment as well!!
Beautiful. But wap 7 acceleration is more than wap 4
Wap4 has DC traction motors and DC motors always have advantages of speed control .Induction motors have poor speed control but singly excited more efficient motors. With the discovery of thyristors based frequency controllers in 90s they are able to control motor speeds comparable to DC motors and hence now 3 phase Induction motors are used everywhere for locomotives. Induction motors also do not require rectifiers for any AC DC conversion as required in DC motors since overhead lines are AC hence lowering costs.
AC=alternating current
DC=direct current.
This is what happens when you learn something at the surface and think that you're a know-it-all.
All 3 phase AC locomotives like WAP-7 have rectifiers. First step down transformer is used to lower voltage, then this AC is rectified into DC. This DC is now converted to 3 phase AC using inverters (can be GTO, IGBT, etc.). SPWM control is used for speed control.
It depends on loco pilots how much they throttle
Wap7 has better acceleration because it was pulling LHB coaches so they capable to go 200 KM/h but restricted in 130 and wap4 was pulling ICF coaches so that only goes up to 110 KM/h
Unschedule halt??
Bhai !
Wap 7 aar Wap 4 era dujunei acceleration bhalui dieche.
Kalke amrao Surat teke Howrah junction obdi journey korlam ADI HWH SF Express e aar amra ei train e asi..aar amader train taake lead korechilo HWH Wap 4.
Aar ei train ta ekhono ICF hi ache lhb hoeni.....
👍⚘❤
win win situation for both ! in acceleration comparison, WAP5 would've won ! Lahore
WAP-4 bcoz the dog is scared 😂😂. And truly wap4 bcoz its hauling ICF coaches
That was an awesome capture of fiery acceleration
It seems even those dogs are watching the acceleration of these two trains 😄
Swag Uncle 😂. Btw loved both !!
Nice capture bro ☺️
Darun p4 er acceleration ta chorom laglo
Depends on driver also.
Actually one of the main factor is the driver. I remember, MMTS local train, in one trip same train never crosses 76 kmph, while on another day with a different driver, touched 96 kmph which was truly amazing. I feel, such slow drivers should be Demoted to shunting services if they cant even drive at permitted speed of 80-90 kmph
It depends on the rakes.... LHB for better acceleration
they both are best but wap7 is modern and wap4 is legendry
Should not forget LHB is lighter than ICF coaches.I say it's unfair comparison
Amazing
WAP 7 IS A GOOD ACCELERATION
Great👍👍
Nice shot.
Answer to title: local train is the best🤣
Bro Loco pilot what telled please tell bro🤔😍☺️
Superb 👍❤❤
as far as i know, since ages, Gujarat Mail was the only non Rajdhani train (shatabdi and duronto are newer versions) to have 11 AC coaches . now this train has been allotted LHB rakes
uncle had the best acceleration!
Wap7 as always but in this case, Wap7 was hauling lhb which is lighter than icf. Any way it was a good plot😎
Op
I think the WAP 7 is better than WAP 4 because WAP 7 has LHB coaches and WAP 4 has ICF coaches
Uncle viral🤣
Right, WAP 4 did a fantastic job
Who loves the icf wheel sound❤❤
Just match time WAP-4 accelerated more fast than WAP-7 ,WAP-4 is winner between both
WAP 4 certainly...👌
i wanna add something as to why LHB coach Train is faster than older ICF coaches.
normally locos do provide hotel power for the coaches to run the electric lights and fans etc
but what when the loco is not connected ? or there is a cable connect issue between loco and coaches at some point along the train ? then what ?
so as backup, ICF coaches have Self generation ie the motion of the coach wheels also drive the generators which also charge the batteries which then provide power to the lights and fans. in AC coaches, this is even more as the coaches has to generate much more energy to drive the AC coaches.
All this ultimately makes the train heavier to move for the Loco .
LHB have only locomotion, the wheels do not drive any type of generators as all electric power is provided by the EOG coaches using a separate diesel generator so they are effectively lighter for the loco as there is no drag from the generators.
so LHB coaches are lighter and faster than ICF coaches irrespective of which loco is being used.
Looks like the WAP7 had the better acceleration.
WAP 7 ANYDAY!
A nice track sound....
Very nice picture
WAP7 is the best👌
It's not about acceleration or speed but it depends on Trains length and passengers capacity 👍🏽
LHB probably allows higher acceleration
Superb acceleration
Where is the Last Vehicle ? if not attached why (LV) Sign Board is not attached to the last coach ?
Wap7 accelerated better
Vandebharat Express full speed 130 and 180 is fake India,s fastest train is gatiman express this is a king of all trains
Guard can feel the acceleration
Some drivers will accelerate gradually to save power
Why do we experience sudden jerks in sleeper trains?
81st view yay
Every tells wap 7 is best for acceleration but i also accept that and when we compared to speed wap 7 top speed 140 but wap 4 top is 183+
Wap 5 is a dad of India,s all engine this is right
That WAP 7 Loco pilot didn't say anything... Usko thumbnail mai aise hi badnaam kr dia 😃😃😃
Thumbnail e jamon ta likhecho tamon toh kichui holona? Lp toh kichui bollona
Saradin motamuti faka kon station ta thake hb chord e? Jonogon ekdom e kom thakle better.
Madhusudanpur, nabagram, jhapandanga
@@pritamdas5529 thank you
Wap 7 ,💥
WAP 7 Is God
first wali ka acceleration high tha 🚉
1:50 the guy in the blue shirt has better acceleration
Wap 7 had LHB coaches which are light in weight one the other side wap 4 had to haul heavier ICF coaches so it were fair than both wap 7 and wap 4 should haul LHB co coaches or both should haul ICF coaches
Meant to add would instead were,
Wap7 and wap4 acceleration are both same
Ans: None of them, EMD locomotives do it better than both
Wap7 is called acceleration king..
So wap7 is winner
1:51 ye aadmi train se tez bhag rahe hain 🤣
Nice capture ❤️
Bᴏᴛʜ ʙᴀɪʏᴀ
Wap7 op🥰😍
WAP4
Excellent
Wap4 did better because ICF rakes are heavier than LHB