Inside a Class 345 train which when photographed was being used on the local / 'all stations' TFL Rail service along the Great Eastern Main Line (GEML) between London Liverpool Street station and Shenfield stations.
When construction works have been completed these trains will be used on the London Crossrail Elezabeth Line services.
Note that the seat on the far right of the photograph has a different colour seat fabric - this designates a seat intended for people who can walk but have limited mobility. These seats are spread throughout the train, always near the doors and at the end of longitudinal seating bays / next to handrails which the passengers can use to help them stand up when the train reaches their destination station. Original public domain image from Flickr