London Underground Employment records 1930s to 1970s

[Gerryk]

If such exists, I am trying to find the employment record of a relative, Martin Peter Kennedy, born in Clonmel, Tipperary, Ireland on January 30th 1911. He was with London Underground, first as a porter, as early as 1938, later as a driver. Then he had an altercation of some sort, had a mild stroke and was put on ticketing duties. He later had another stroke and was, presumably retired on pension. He died in September 1979.
All guidance appreciated.
Thank you.
Gerry

[Kevin Burrell]

Hi Gerry
On Ancestry there is a staff register, but only goes up to 1931

I think the information may be available on the Transport for London site - but the info is not online and it also looks to be separated into the specific underground lines...
https://tfl.gov.uk/corporate/about-tfl/culture-and-heritage/corporate-archives/about-the-tfl-archives

Cheers
Kev