London transport system crippled as Tube workers go on strike . Normal service not due to resume until Friday morning . Buses crammed with commuters ; many chose to cycle , walk to work . Comment:
London transport system crippled as Tube workers go on strike . Normal service not due to resume until Friday morning . Buses crammed with commuters ; many chose to cycle , walk to work . RMT trade union called strike in dispute over pay , job cuts , disciplinary issues .