Why do you need 2 Class 20s to haul 2 FNA wagons?

[EEType3]

So when 2x20s are on a nuclear flask run are they both powered? I'm assuming only one is powered and the other is there should the other fail.

[ewsjo]

It's not just the 20s, it's whatever traction is on the flasks.
66s and 57s only generally work within class, though 20s and 37s can be mixed. Unless they are an incompatible pairing, eg 37 and 66, then normally both locos are powering in multiple, with a crew member in the rear cab keeping an eye on the load.
Here's a gallery showing the mixes that can appear on the Bridgwater flasks
http://joalder.smugmug.com/Trains/Headc ... Crewe-CLS/

jo

[RobertM]

Wow, Eddie Stobbart has expended his operations abit

[MattH2580]

I've seen a 37 with 3 20s pulling 2 flasks. I'll provide a link if I can find it

EDIT: Here's the link to the video:

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Skip to around 9:28.

Also, if I heard correctly, the spirax valve on the 37 ticked; does this mean the 37 was not actually providing any power?

EDIT (Again): Nevermind, the 37 powers up after they pass the station (as far as I am aware the thrash you can hear is from the 37).

Regards,

- Matt

[faedundee2]

So when 2x20s are on a nuclear flask run are they both powered? I'm assuming only one is powered and the other is there should the other fail.

Both power, the locos hauling the train are usually in multiple(occasionally with another loco DIT) during BR days all nuclear flask traffic which at the time was handled by Class 31s they also worked in multiple with RNA runners between the locos and the loads as well as between the brakevan at the rear of the train as seen here https://www.flickr.com/photos/dmc1947/5759678968/

[749006]

So when 2x20s are on a nuclear flask run are they both powered? I'm assuming only one is powered and the other is there should the other fail.

Normally both locos power the train to save one loco doing the work and the other loco is already running should one of them shut down.

[yyyyamst]

Slightly off track but just to mention the seasonal outings of Snow Ploughs. Again two Locos sandwiched between Ploughs