four o'clock
`` No joke , at all . You know the old stone bridge over the creek ? '' `` Sure . '' `` Well , the railroad wants to get rid of it and do it quickly , so they can build another , so the contractors are going to blow the old bridge up with dynamite at half-past four o'clock . '' `` Let 's go ! '' burst out Phil . `` It will be a great sight -- to see that old bridge go up . ''