The Roarers

[ChrisCooper]

86/1s and 87s need the rheostatic to work instantly to be able to run at 110mph on 100mph signal spacing. Without working rheostatic they are restricted to 100mph.

Just to clear up another possible source of confusion, putting the controller to off will open the motor contactors and shut off power instantly.

Also, due to the power of the electric locos, they wouldn't spend that much time on full power, and they would not be doing 100mph on full power, other than perhaps up Shap and Beatock. I doubt full uniterupted run ups and run downs were that common, other than for neutral sections when accelerating or on steep gradients. That is of cource where the 90s had a big advantage over 87s as they could be off and on power far quicker, wheras the tap changers took over a minute to go from full power to off and back to full power. I remember someone saying that 87s would loose at least 10mph at some neutral sections, wheras 90s would barely loose any speed.

 

[Peter Mugridge]

Also, due to the power of the electric locos, they wouldn't spend that much time on full power, and they would not be doing 100mph on full power, other than perhaps up Shap and Beatock.

I thought there was a 75mph restriction up Shap in loco haulage days because they would riosk overheating otherwise?

Not sure if there was a similar restriction up Beattock??

 

[phil8715]

Wern't class 83/84's withdrawn because they kept bursting into flames? Hence their other nickmame Fire Engines!

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[captainbigun]

86/1s and 87s need the rheostatic to work instantly to be able to run at 110mph on 100mph signal spacing. Without working rheostatic they are restricted to 100mph.

Strictly speaking that's not true. Friction brakes quite capable of stopping a train from 110 - which would be formed of Mk3s which in turn have a far superior braking rate to Mk1s/2s.

 

[Old Timer]

I thought there was a 75mph restriction up Shap in loco haulage days because they would riosk overheating otherwise?

Not sure if there was a similar restriction up Beattock??

There were no restrictions other than those related to track. Passenger services could easily run at 100mph depending upon loco type and load.

For clarity there was 80mph restriction on overnight sleepers but this was to do with comfort and fitting them in around F/Liners. After 22:00 any sleeper would only run at 100 mph if it was running late.

 

[electra27000]

The class 82s and 83s were withdrawn from main line traffic in 1982 but five (82005/008 and 83009/012/015) were re-instated for ECS duties between Euston and Wembley in 1983, apart from 83012 which was re-instated in 1985.

83012 had been in use at Longsight depot as a static generator from Feb 1982 to Dec 1984 to enable class 506 EMUs to travel to and from the depot after Reddish depot closed.

It was 83009 that served as a transformer, rather than 83012, to permit the class 506 units to be tested at Longsight - following Reddish depot's closure in April 1983. It was moved south, following the withdrawal of the units in December 1984, with the intention of using it as spares for the other two 83s. However, Willesden found it to be in good condition and it was reinstated (and given a repaint into BR blue) instead.

 

[phil8715]

86/1s and 87s need the rheostatic to work instantly to be able to run at 110mph on 100mph signal spacing. Without working rheostatic they are restricted to 100mph.

Just to clear up another possible source of confusion, putting the controller to off will open the motor contactors and shut off power instantly.

Also, due to the power of the electric locos, they wouldn't spend that much time on full power, and they would not be doing 100mph on full power, other than perhaps up Shap and Beatock. I doubt full uniterupted run ups and run downs were that common, other than for neutral sections when accelerating or on steep gradients. That is of cource where the 90s had a big advantage over 87s as they could be off and on power far quicker, wheras the tap changers took over a minute to go from full power to off and back to full power. I remember someone saying that 87s would loose at least 10mph at some neutral sections, wheras 90s would barely loose any speed.

What really used get my goat was when a train was allocated a class 87 say the Royal Scot and a class 86/1/2 turns up on the train it left me completed withered.


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