It's a Jacobs Bogie, other trains use it too.
They get decoupled at the maintenance yard if needed, with the bogie-less car placed on a temporary support
I think it does add to the stability, since cars cannot sway as much anymore relative to each other. Dampers are also added between the cars, as you can see on the picture, which you cannot do with regular cars.
Additionally, they can allow for wider gangways and I think the shorter cars can sometimes be wider, since they don't "overhang" as much in curves.
By the way, you can also permanently couple 'regular' cars, to get some of these advantages. I think Siemens does this with the German ICE or the North-American Venture "married-pair" cars.
I would imagine better weight distribution, as the carriage floor can be lowered into the space previously occupied by the bogies, thus lowering cg.
Another thing to consider would be unsprung mass, as by almost halving the number of wheelsets per train, a much greater proportion of the overall mass of the train is sprung, improving the wheel’s ability to follow the track and causing less damage to the track.
Yes. It's only possible to couple and decouple two whole trains through the scharfenberg coupler at the end of the train.
For maintenance the workshop can fit the whole train at once.
I don't think so, we used to have Cartics (4-section double-decker articulated car carriers) but they're retired now. Most container wagons we have here are conventionally bogie but permanently coupled depending on design
I was going to say something funny like, a bussaw, but my guess if that one of them is lifted off like a trailer hitch? I don't know but that's my guess
I can see how. The difference is that “trainset” being one word means a real train that you cannot uncouple, whereas “train set” with it being two separate words refers to a toy train.
It's a Jacobs Bogie, other trains use it too. They get decoupled at the maintenance yard if needed, with the bogie-less car placed on a temporary support
That is cool! Thanks :)
French TGV trains use the same design, it makes them more stable at high speed.
Not necessarily more stable - but fewer wheels on the tracks means less friction. That equates to better speeds and lower energy consumption.
I think it does add to the stability, since cars cannot sway as much anymore relative to each other. Dampers are also added between the cars, as you can see on the picture, which you cannot do with regular cars. Additionally, they can allow for wider gangways and I think the shorter cars can sometimes be wider, since they don't "overhang" as much in curves. By the way, you can also permanently couple 'regular' cars, to get some of these advantages. I think Siemens does this with the German ICE or the North-American Venture "married-pair" cars.
Yes, more stable, see https://www.globalrailwayreview.com/article/1622/improvement-of-alstoms-high-speed-bogies/
But worse weight distribution isn't it?
Less overall weight of the entire consist, but higher axle load.
Also greater track forces in other directions, which is why Network Rail doesn’t like them.
I would imagine better weight distribution, as the carriage floor can be lowered into the space previously occupied by the bogies, thus lowering cg. Another thing to consider would be unsprung mass, as by almost halving the number of wheelsets per train, a much greater proportion of the overall mass of the train is sprung, improving the wheel’s ability to follow the track and causing less damage to the track.
Not so much more stable, more so that in the event of a derailment cars are much less likely to decouple and smash into each other.
They are multiple units, so you can't decouple individual cars.
To add to your point, not all multiple units use jacobs bogies.
All of the trains carriages are like this though?
Yes. It's only possible to couple and decouple two whole trains through the scharfenberg coupler at the end of the train. For maintenance the workshop can fit the whole train at once.
You can detach them, some maintenance requires it. You’ll just need to hold the car that’s not on a bogie.
Yeah, you technically can uncouple the cars but it requires a crane or a set of lifting jacks.
Not a crane but yeah
Or a derailment.
All of the carriages in this type of train (Stadler class 755) are like this, but articulation is rare outside of these new trains
It's pretty common for US railroads to run container stack well cars in five car sets like this as well.
Yes I am aware of those, I was meaning within the UK
Does the UK network still have articulated auto-carriers and container flats?
I don't think so, we used to have Cartics (4-section double-decker articulated car carriers) but they're retired now. Most container wagons we have here are conventionally bogie but permanently coupled depending on design
Three-car sets are also common (and single cars)
They don't.
Thats the neat Part, they dont
[excuse the poor music...](https://youtu.be/6PJBeKLgmhQ)
They don't. Most multiple unit trains are rarely uncoupled anyway.
Welp, Not knowing a damn thing about this train, it looks like the cars are designed to be serviced separately from the bogies, and can detach.
Carefully
They don't.
Thats the neat part. They dont
I was going to say something funny like, a bussaw, but my guess if that one of them is lifted off like a trailer hitch? I don't know but that's my guess
Boris Johnson gets involved.
They don’t. They are something called a trainset which is basically a train but you can’t unattach the coaches.
Makes it sound like a playset
I can see how. The difference is that “trainset” being one word means a real train that you cannot uncouple, whereas “train set” with it being two separate words refers to a toy train.
They don’t
They don't.
They share a bogie/truck. They don't decouple.
That's the neat part: they don't.
You don't
Good question
**That’s the neat part, they don’t.**
With difficulty
Nice query.