Transport Secretary Grant Shapps said the service will need to spend more money after 'badly breaching' performance targets.
The mayor says the threat of franchise removal hasn't gone away and he will also be requesting that the operator is fined.
David Jamieson has asked passengers to share their West Midlands Trains experiences.
West Midlands Trains has been criticised for delays and cancellations, which have threatened the future of the franchise.
David Jamieson said he shares the public's 'extreme concern and frustration' in regards to failing timetables and overcrowded trains.
Boris Johnson has suggested West Midlands Trains could lose its franchise after the service is described as "absolutely woeful" in Commons.
Mayor Andy Street has called the service 'woeful' and 'lost faith' in their ability to run the network after months of problems.
Passengers are being warned of a "skeleton service" as West Midlands Trains union members plan to walk out in November and December.