The Anonymous Widower

Pret A Manger Comes To Dalston On Friday

It appears that Pret a Manger’s new Dalston branch opens on Friday.

But search the Internet and not everybody is happy.

Pret is accused of the gentrification of Dalston.

December 3, 2019 Posted by | Food | , , | 2 Comments

The 125 mph Bi-Mode Flirt

I am convinced that Stadler’s bi-mode Flirt of which Greater Anglia’s Class 755 trains are the first such fleet to go into service anywhere in the world, are trains that are capable of being developed into a train that can cruise at 125 mph.

Rumours Of 125 mph

When the Flirts were first introduced, I asked a driver, if a 125 mph version was possible and he said yes.

Not that Greater Anglia would have much use for a 125 mph bi-mode.

But it had been reported that several of the drivers had been on trips to Switzerland, as part of the design and training process to smooth the entry of the fleet into service.

And all drivers like to talk about their charges be they freight locomotives, high speed trains, heavy trucks, racing cars (I had a Stig in my kitchen!) or complicated dockside or tower cranes.

Norway’s 120 mph Flirts

Norway runs all-electric Flirts at 200 kph or 120 mph, as described here in Wikipedia.

The basic train design should be capable of running at 125 mph.

Could The PowerPack Run At 125 mph?

This picture shows the PowerPack on a Class 755 train.

It is only 6.69 metres long and it weighs 27.9 tonnes.

The weight is not out of line with the weight of the 20.81 metre long driver car, which weighs 27.2 tonnes and the 15.22 metre long pantograph car, which weighs 16 tonnes.

But Stadler have put large dampers between the cars.

The dampers are the long black cylinders connecting the two cars. There are two on this side of the train and I suspect there are two on the other side.

It looks to me, that Stadler have paid very detailed attention to the dynamics of these trains and seem to hae done the following.

  • Carefully balanced the weights.
  • Driven the train from the two bogies under the driving cabs.
  • Used powerful dampers to calm everything down.

This is probably to enable good performance on both fast and not-so-straight routes.

I also suspect that Swiss railways are a much more challenging environment for running trains, than East Anglia and most of our 125 mph lines.

I wouldn’t be surprised to find out that a Class 755 train could run at or near 125 mph on a straight 125 mph line, whilst running on electric power.

Operating Speed On Diesel

I suspect the power requirements for 125 mph would be too much for the installed power in the PowerPack, but 100 mph would certainly be possible.

Ts There A Need For A 125 mph On Electric/100 mph On Diesel Flirt?

If you look at the UK, Hitachi have sold lots of Class 800 and 802 trains, which have a similar performance, but are a few mph faster on diesel.

It would appear that the market is there in the UK.

But the UK is only one of a large number of markets, where Flirts have been sold.

Greater Anglia will be running three services with a large proportion of electrified line.

  • Norwich and Stansted Airport
  • Lowestoft and Liverpool Street
  • Colchester and Peterborough

How the Class 755 trains perform on these services could be crucial to the development and success of Stadler’s unique concept.

 

December 3, 2019 Posted by | Transport | , , | Leave a comment