abandon abandoned bomb-care empty evacuated grab-pole handle handles interior London poles seat seats subway traffic train transport transportation tube Underground boy colored colorful colors coloured colourful colours commuters commuting father grab-handles grip gripping handholds hanging-strap held holding-on man movement moving passengers people railway secure security son standing standing-passengers strap-hung-handles straps suspended-strap toddler transit travel travelers traveling travellers travelling views wait waiting window window-views