Railway Performance Society Magazine - Milepost

8xx acceleration

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Hartill

Posts: 77
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8xx acceleration - Posted: February 13, 2020 - 5:55 PM Quote and reply
From initial runs it seems that the straight electric sets are slightly quicker of the mark than the bimodes.

eg SB from Northallerton
801/1 0-100 110.3s
802/2 0-100 119.7s

This is what you would expect with the straight electrics not carrying so much weight, having the same traction package and a better power to weight ratio.

You do need an unrestricted start to asses this but I would be interested to see if other members have noticed this.

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dstannard

Posts: 28
Location: cheshire, uk
Re: 8xx acceleration - Posted: February 13, 2020 - 7:19 PM Quote and reply
Hartill said:
From initial runs it seems that the straight electric sets are slightly quicker of the mark than the bimodes.

eg SB from Northallerton
801/1 0-100 110.3s
802/2 0-100 119.7s

This is what you would expect with the straight electrics not carrying so much weight, having the same traction package and a better power to weight ratio.

You do need an unrestricted start to asses this but I would be interested to see if other members have noticed this.




Interesting result comparing 5-car LNER electrics and TPE bimodes accelerating on electric power.

Have done some modelling of the power output of LNER 9-car 801/2 (all electric) and 800/1 (bimodes) with the suggestion that both have similar acceleration rates, implying slightly reduced traction power of the all electric versions to compensate for their slightly lower weight.

More direct comparison measurements would be useful.


David Stannard
RPS Committee - Technical
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