You asked
I would like to know how many people died either by suicide or other means on the TFL network between the years 2012-2019.
I would like this to be separated by each underground line.
We said
Thank you for your query.
We do not hold the exact data you have requested. We publish official statistics on the number of suicides as part of the annual Suicides in the UK release, which includes methods as outlined in Table 20: https://www.ons.gov.uk/peoplepopulationandcommunity/birthsdeathsandmarriages/deaths/datasets/suicidesintheunitedkingdomreferencetables. Data may be available to commission as a bespoke analysis. Such services would fall outside of the Freedom of Information regime and would be subject to legal frameworks, disclosure control, resources and agreement of costs where appropriate. If you would like to discuss your requirements further, please contact health.data@ons.gov.uk. For more information about our charging rates, please see our website.
Please also note, you may find the information you need from the Department for Transport's publication of Transport statistics, which includes rail accidents and casualties.