Network Rail and Thameslink bosses face the London Assembly's Transport Committee later.
Rail executives will be questioned over recent overcrowding and chaos at London Bridge station.
Commuters faced weeks of disruption because of reconstruction work at the station.
Deputy Mayor Victoria Borwick has been selected as the Conservative candidate for Kensington, in the General Election.
She hinted today that election in May could see her step down as Boris Johnson's deputy so she could focus on her local constituency.
New figures obtained by a London Assembly member have revealed that Transport for London is planning to cut around a fifth of staff working in stations across the network.
The proposals would see staffing cut at 216 stations with around 588 workers due to be cut in total across the network.
London Assembly Labour group transport spokesman Val Shawcross said the impact would vary across the capital but some stations could see as much as a 58% reduction in staff.
The following guests will discuss London's taxi and private hire services later today:
- Matthew Daus, US guest & President, International Association of Transportation Regulators
- John Stewart, Chair of Policy Committee, London Travelwatch
- Seema Chandwani, Policy and Services Manager, Suzy Lamplugh Trust
- Faryal Velmi, Director, Transport for All
- John Dickie, Director of Strategy & Policy, London First
Over 300,000 trips a day are made in taxis and minicabs - and as the taxi debate in London heats up, the London Assembly Transport Committee begins a timely investigation today into taxi and private hire services in London.
The London Assembly will investigate if taxi and private hire services are meeting passenger needs, how can safety be improved, and can London learn any lessons from the experiences of New York and other world cities?
The London Assembly is to examine whether the capital's health services can cope with future demand on resources.
Demand for healthcare is expected to grow by four per cent each year, which could mean an NHS funding gap of £30bn by 2020.
A London Assembly report has found that the Metropolitan Police has failed to make a "convincing case" for buying three water cannon.
The police and crime committee says that, with no specific intelligence of disorder, it is unclear why there is a "rush" to get them.
London Mayor Boris Johnson is consulting on plans to pay up to £100,000 each for three second-hand water cannon from Germany.
The Met has said the water cannon would be "rarely seen and rarely used" and it claims to have public support for the idea.
The vehicles have been used in Northern Ireland but they are not currently authorised in mainland Britain.
The home secretary must approve their introduction in England and Wales.
The Environment Committee will quiz London Assembly experts and the Environment Agency today about whether the capital is sufficiently equipped to deal with future rising water levels and flood threats.
Experts from the Environment Agency, the National Flood Florum and the London Assembly will answer questions on the sustainability of London's flood defences and the capital's readiness to react in an emergency.