Union Pacific "Big Boy"
 

The world's largest steam locomotive is the Union Pacific Big Boy (a 4-8-8-4), it is articulated to allow it go around curves. They were built to take freight over the Wasatch mountains (Utah/Wyoming). At full steam it could exhaust its tender in 2 hours (25 tons), no fireman could keep up with its need for coal so it used a mechanical auger to supply the firebox but in the proper facility it could be reloaded in 8 minutes. This one, #4014, has just finished being refurbished and is on a test run:

https://www.youtube.com/watch?v=6nIawf-FK8M

Re: Union Pacific "Big Boy"
 

That is truly awesome - but emissions may be a problem LOL

On a slightly smaller scale, but well used around the world where steep grades, narrow gauges and sharp curves and axle loading of the track was limited the Beyer-Garratt enjoyed great success - they had one on the drawing board to have 115,000 lbs tractive effort ( biggest ones up till then were about 80 to 90,000 lbs ) - like the Big Boy they were articulated, they came in various sizes and some with 16 driving wheels. I can remember seeing them in South Africa, Rhodesia and Australia - they were unmistakable, both for the 'off-beat' exhaust sound ( like a V twin ) and the water tender at the front, I think some of them had a mechanical stoker as well.

https://www.youtube.com/watch?v=UfqDyOjIOMU

https://www.youtube.com/watch?v=UitOupBEYgc


http://www.theheritageportal.co.za/a...att-locomotive

Re: Union Pacific "Big Boy"
 

Thought I would never see the end of this train - I remember stopping at a crossing in Pennsylvania and having a long, long, long train go past - Europe may have faster trains but for sheer awesomeness you have to look at American stuff.

https://www.youtube.com/watch?v=zRrzC-JBzfs

https://www.youtube.com/watch?v=N3VjUp9oz8o

Re: Union Pacific "Big Boy"
 

I don't know if all the locomotives are the same on that hill start but if they are all EMD 70Ace they're each rated at 4300 hp, 3 leading and 2 helping; that's a lot of grunt.

Speaking of emissions, take a look at another Union Pacific engine, a 4-6-6-0. I'm wondering if this was running on oil (take a look at the 1:08 point).
https://www.youtube.com/watch?v=LHI5VHBwIfI

Re: Union Pacific "Big Boy"
 

OMG they didn't get that much smoke when Mt. St. Helens erupted.

Re: Union Pacific "Big Boy"
 

That is one big mofo of a loco.

Did anyone else notice that there was an SD70AH weighing around 195 tons coupled on the back instead of a brake car. I guess the Big Boy would take quite a bit of stopping if there was a problem on a down grade.

(Or maybe they were worried that they might have to push it home)

Re: Union Pacific "Big Boy"
 

It's usual on steam specials on the UK mainline to have a class 47 bolted on the back in case of breakdowns. It can often help as a banker in rubbish weather and to set off from a standing start depending on the gradient.

Having your own Thunderbird loco with you is much easier than waiting for one of the class 67 units kept on standby around the network.

Re: Union Pacific "Big Boy"
 

Sad fact for today - there is actually a unit called "Thunderbird" and it has been used as a standby loco.

Re: Union Pacific "Big Boy"
 

If your on about in the UK, there's 5 iirc. All class 66 or 67 diesels

Now that is sad!

Sent from my ANE-LX1 using Tapatalk

Re: Union Pacific "Big Boy"
 

There are a few 57s used as Thuderbirds too, a few have Delner couplings fitted so they can rescue Pendolino's if needed.