Hello, I was wondering if it would be possible to somehow get access to data regarding the regenerative braking system of the Underground. Possibly data about the energy produced by the system and the different types of fleet for the different lines? Is it also possible to get data associating energy required for the heating and cooling of the Underground? Thank you for your help.

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Our ref: FOI-2080-2021

Thank you for your request received by Transport for London (TfL) on 15 January 2021 asking for information about the Regenerative Braking System and Heating & Cooling Data for the tube.

Your request has been considered in accordance with the requirements of the Freedom of Information Act (FOIA) and our Information Access Policy. I can confirm we do confirm the information you requested. You asked:

Would it be possible to somehow get access to data regarding the regenerative braking system of the Underground. Possibly data about the energy produced by the system and the different types of fleet for the different lines?

Is it also possible to get data associating energy required for the heating and cooling of the Underground?

Please find attached the information you requested.

Line	Stock	Regen	Notes
Bakerloo	72TS	No	This fleet pre-dates the capability to do regeneration, but does brake electrically with energy dissipated into an onboard resistor
Central	92TS	Yes	The current traction system can regen to 790VDC
Waterloo and City
Victoria	09TS	Yes	The trains are capable of regeneration at 890VDC when there is a receptive load on the line. The whole line is treated as one electrical section to maximise efficacy of re-gen
Metropolitan	S8	Yes	All the S stock trains are capable of regeneration. Regen voltages are 650, 790 or 890 VDC depending on the location of the train and other assets operating in those areas.
Circle	S7
Hammersmith and City
District
Jubilee	96TS	Yes	The current traction system can regen to 790VDC
			This fleet is being fitted with a new traction system which will enable a more efficient re-gen using similar traction equipment to the 09TS and S-stock
Northern	95TS	Yes	The current traction system can regen to 790VDC
Piccadilly	73TS	No	This fleet pre-dates the capability to do regeneration, but does brake electrically with energy dissipated into an onboard resistor
Engineering trains	Various	-	Battery Schoma locomotives are capable of recharging the onboard batteries when braking - these vehicles are not currently in operational use

If you are considering submitting a further FOI request please think carefully about whether the request is essential at this current time, as answering FOI requests will require the use of limited resources and the attention of staff who could be supporting other essential activity. Where requests are made, please note that our response time may be impacted by the current situation.

Please see the attached information sheet for details of your right to appeal.

Yours sincerely,

Melissa Nichols

FOI Case Officer

General Counsel

Transport for London

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