you can send text message and find out what benefits you're eligible for. >> john hedron, al jazeera, chicago. >> one of the most advanced railway lines ever built is taking shape. it runs underneath london. cross rail will across the east with the west when it opens in three years time. our technology editor has been seeing what it's hundred million passengers a year can expect. >> it has taken 10,000 workers more than 6 years but now london's underground train tunnels are almost ready for their rails. cut at a depth of 40 meters tunnels weave their way beneath the heart of the city. >> the biggest challenge has been constructing this project in an area of london of already dense infrastructure. it's design stage, the alignments have to be decided in terms of horizontal and vertical alignment to avoid any interaction with existing foundation or tunnels. >> eight laser-guided tunneling machines removed more than 7 million tons of earth. the walls of the tunnels were then sealed using 200,000 concrete segments. at the same time engineers have been working on an all-new digital communic

john hedron is in that rally in chicago. >> this diverse political rally is sponsored by a group calling itself the chicago alliance against racist and political repression. what they want is a new police board, an oversight board elected by the people and not appointed by the mayor, as is now the case. while a lot of focus is on ferguson, missouri, and baltimore, but they say there is a long history of police abuse. 120 people have been killed wrongfully by police since 2007, and the current police over site board has not held anyone accountable. this is something of a diverse crowd. it is black, white, and a number of people from all over chicago. this is not a very small group. you see the black matter signs, black lives matter signs that extend out of ferguson, missouri, this is a group calling for change in a city with a long history of bad relations with the chicago police department. we did reach out to the police and to their union and we're still waiting for a response. >> ten years it has been since hurricane katrina blasted its way through the gulf coast of the united states l

john hedron was at that protest. >> on chicago's most storied streets. the demonstrators condemn death. the state of recent deaths of young black men in police custody have focus been focused on places like baltimore and ferguson, missouri. but here in chicago the police abuse and unjustified killings have gone on for decades. they protest the treatment of blacks and the poor by chicago police. >> you don't see many if any people of certain higher tax brackets being beaten or harassed by police. you see that fo for african-americans. >> the police set aside a $5.5 million re reparation fund for victims. former police chief burge was sent to prison for overseeing torture, shocks and beatings. >> all did i was listen. i just stopped and listened to the victims of police torture, and it is literally joy ray justice. i don't know how anyone can hear that and not doing whatever they can to get involved. >> these people say they want a new civilian ove sight oversight board. >> they have literally done nothing. they have not held police accountable. they've be