Request ID: FOI-0375-2122 Date published: 07 June 2021
You asked
clarification 25.5.21
Thank-you for your clarification request "please can you confirm what source of vibration you are asking for the information about, for example from trains, engineering works, road traffic, etc or something else."
I am requested the document containing vibration criteria used for protection of DLR assets from sources of vibration on adjcent sites. In connection with the development of a site adjcent to a section of DLR land I have been asked to "provide an impact assessment indicating the expected vibration levels on DLR assets".
I expect that a document containing the criteria for which it is decided whether mitigation is required will contain criteria for a range of different railway assets.
Original request
Dear Docklands Light Railway Limited,
Please can you provide a document containing the criteria for which assessment can be carried out of the impact of groundborne vibration on DLR assets?
We answered
TfL Ref 0375-2021/22
Thank you for your clarification of your request received by Transport for London (TfL) on 25 May 2021 asking for information containing vibration criteria used for protection of DLR assets from sources of vibration on adjacent sites.
Your request has been considered in accordance with the requirements of the Freedom of Information Act and our information access policy.
Unfortunately we do not hold the information you have requested as we do not have a document that sets out the vibration limits on DLR infrastructure.
As the DLR is an automated service, there is a range of equipment attached to our structures required to run the DLR trains. As such, DLR infrastructure is more sensitive to ground based vibrations than other railway operations. Due to the variety of DLR infrastructure and equipment arrangements and ground conditions along the DLR network, our engineers assess the impact of proposed works on a site by site basis to determine what further assessment or mitigation measures may be required; this is dependent on the DLR assets, structures and equipment in the area that may be affected.
We are not clear on which site adjacent to a section of the DLR you are referring to but please contact our Outside Parties team at [email protected] and include which site you are working for, so we can provide more advice via the engineer allocated to the job.
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
Sara Thomas FOI Case Management Team General Counsel Transport for London
