3270 bridge and locktender jobs have been eliminated over six years, found by subtracting the current number of jobs from the initial number.
The question asks how many bridge and locktender jobs have been eliminated over a span of six years. To calculate the number of jobs that have been eliminated, we subtract the current number of jobs from the initial number of jobs. So, we calculate 6670 (initial jobs) - 3400 (current jobs) which equals 3270.
Therefore, the answer is 3270 bridge and locktender jobs have been eliminated.