Class 700 thameslink AC vs DC power sounds compared

[@jebediahkerman4251]

i was always use to the DC sound of the class 700 since i live in the south, although i never knew that when using Overhead wires it Sounds completely different, I've been to St Pancras station traveling on one i have no idea how i haven't noticed that.

[@filip9587]

Never knew that's what that wobbly sound was. Thanks for the knowledge.

[@Myron0117]

so basically the DC sound is wobbeling around and the AC sound is smoothly beautiful but also a bit quieter I guess? love it

[@SShiJie]

Im a student studying Rapid Transit in my final year of Polytechnic, thank you for recording this so I can know whats the difference.

[@Suliplayz5264]

wait thats a thing u can study? where do i sign up?!

[@jimtaylor294]

0:02 That moment when the Class 700 likes to mimic a 1950's spaceship 😌👌

[@miahaskurti4539]

I Like Overhead Lines Because Of Smoother Rides On Trains

[@theblockybanana5537]

Still smooth on DC power

[@LtSerg756]

DC sounds like an alarm

[@skullgeezer7174]

The class 700 sounds like a Class 444 when on DC power.

[@alfiegorman2185]

Same engineering firm built both, Siemens built the class 444 and 450, then took the contract of the 700

[@that1asian53]

Whatever the first 1 is is way yy better then the second 1

[@tjfSIM]

Oh wow, I always wondered what that odd sound was. I've only ever heard them on 3rd rail and thought they just sounded like that, but they actually seem much more at home on AC.

[@FarmYard-Trains]

Almost all trains are with the extra juice from OHLE, though the 707 accelerates about as quickly since it only has the DC packages

[@GTown054]

Keep up the amazing work!!😎 You have my like and sub👍👍😀. Looking forward to more great footage.

[@Andrewjg_89]

Class 700 on AC 25kv OHL sounds lot different from the other Desiro trains that use overhead wires. Wish it would sound more of the same as on the Class 360, Class 350 and SWR Class 444 & Class 450.

[@Chris-qg6kc]

I bet good money that the first one is a retro car alarm.

[@EpicThe112]

Class 700 has a quicker acceleration on AC 25kv than DC 750v DC top contact third rail. Same way for the Thameslink Govia Southern 377/2 377/5 377/7 387/1 & 387/2 electrostar fleet AC OHLE quick acceleration but slower acceleration on DC Third Rail. If you come here to NEC New York New Haven it's American equivalent the Metro-North M8 has the same OHLE quick acceleration but slow acceleration DC 750V Third Rail

[@samuelitooooo]

As a New Yorker, I'd like to dispute this. M7s and M9s, which are third-rail only, accelerate at the same rate as M8s. I have a spec sheet that lists the M7's acceleration at 0.9 m/s². The New York City Subway, entirely third rail, accelerates even faster at 1.11 m/s².

[@edot_nyc]

@@samuelitooooo Incorrect. While they both have the same posted acceleration rate, that does not mean one train is not faster than the other. This is true to many trains in the nyc subway. They all have an acceleration rate of 2.5mph/ps, however it’s well known that a train like the R160 type is faster than the older R46 type.

[@edot_nyc]

@@samuelitooooo The MTA also conducted a test during the testing phases of the M8’s back in 2013. They found that when the train was running on AC power it was accelerating faster.

[@Myron0117]

keep in mind that acceleration is impacted and can variate by weight

[@hiba_lamzouri30]

Train Class 700 DC AC ineter 3rd Rail love

[@e.d.gproductions7989]

I have two questions 1. Why is overhead power not used inside of London instead of the third rail? 2. Why is there a sound difference between AC And DC?

[@LondonTransportMaster]

3rd rail in London is only used on Southern, South Western and South Eastern regions, aswell as the East/South/West London Lines, part of the North London Line and the Northern City line. All other railways into London (with the exception of the (Chiltern Mainline) use OHLE

[@InverhavonRailways]

Third rail was used on the Southern Region simply because it was cheaper. Early experiments were done with AC,but were abandoned in favour of 3rd rail.

[@scl190]

I think it’s different because the 700 runs on AC and the third rail picks up DC, so it has a transformer rectifier on board to rectify the difference (in very very basic terms) so that’s the difference in sound, that could be completely wrong though

[@e.d.gproductions7989]

@@scl190 yes i understand that but the question was why not use only one

[@scl190]

@@e.d.gproductions7989 just the way they are built at a guess

[@concofps]

So do all DC enabled trains have AC motors, or do the ones that are 3rd rail only have DC motors? I'm assuming former because that DC sound of the 700 is similar to that of say a 450

[@CrashCoreBeamNG]

Depends. Look at the Wikipedia for said train and check the motor or something

[@NCHLT]

No. Many older trains have DC motors

[@spongebot64]

It's more so that any train past the 80s/90s is bound to use AC motors due to being more powerful and efficient than DC motors. Whether or not it gets its power from AC/DC doesn't matter; aside from lower power capacity on DC, trains are able to take whatever power source (within their design) and use it for their needs.

[@isaacfoster2820]

​@@spongebot64 does ac trains use full capacity though cos it would go really fast

[@congrelmunt8769]

​@isaacfoster2820 no. The inverters that control the AC motors are powered by 750V DC only. So when class700 are using 25kv, it is rectified to suit the 750dc inverters

[@Sainsburys_Local]

I like DC sound And pancras platform is noisy Curve a lot

[@CoolTransport]

nice!

[@HMStrainspotter]

I think the 700 sounds better on AC but i do like them on DC also i hear them mainly on DC but when i go to London i hear them on AC

[@HMStrainspotter]

On the way in to London they switched from DC to AC and on the way out of London towards Brighton they switch from AC to DC at Farringdon

[@MatStuff]

Nice

[@lolwutplotagon]

ac's better than dc's

[@Martin_Trainspotter]

The DC sound sounds like an alarm. 😅

[@JTW8414]

I was confused in tsw4 when it was using DC and im suddenly on a area that uses AC, so the sound changes

[@retrobuild4614]

Sounds like London Northwestern Railway.

[@ChristopherPin]

The 350s

[@SadLivingPerson]

I DIDNT REALISE THERE WAS A DIFFERENCE!

[@RegularFantaTheBest]

I like the AC cuz i’m in hertfordshiere

[@PK345Transport]

AC is better

[@sparkyUK]

The DC pickup is a horrible noise.

[@miahaskurti4539]

Can The Class 450 & 350 Do The Same On Third Rail & Overhead Lines

[@somerandomguy1828]

actually no for third rail and overhead lines the 450 and 350 traction motors sound the same

[@FrecciaNeraM36]

The 350 used to be dual voltage, and made a difference sound when it operated on the third rail between Shepherds Bush and Croydon.

[@miahaskurti4539]

@@FrecciaNeraM36 Ok

[@theblockybanana5537]

Class 450 has no panto. Class 350 on AC sounds like the 700 on DC. When the 350 is on DC, it sounds really high pitched, think class 450 when it has accelerated to a high speed and is now doing high pitched oscillation

[@jettepaque2771]

The only time I like the AC power is when I go to a museum

[@MPDTransport]

What's the difference between a class 378 on dc and a class 378 on ac

[@Trainguy336]

The DC has overheard Wires AC is diesel powered

[@oforid2227]

the motor i think changes depending on the Current

[@Trainguy336]

@@oforid2227 Oh Yeah

[@Paul_707]

The motors are all 3 phase AC, but that AC is produced on the train in electronic devices known as traction converters. The variable switching frequencies used in the converters are set up to cause minimum interference to other trackside equipment. They are set differently dependent on the presence of other lineside equipment such as signalling.

[@dpadjoystick]

​@@Trainguy336 bro are you alright?

[@somerandomguy1828]

honestly prefer ohle traction motors

[@CrashCoreBeamNG]

Main channel: kzbin.info i post here a lot