Perhaps if the line is a dedicated high speed right of way ... maybe just grading the preliminary sub-roadbed, all the way from terminus to terminus would be the first step (employing just a few hundered people).
No Track, no signals, no wiring, no nothing extra ... then after the sub-roadbed route is approved ... then build the track and wiring ... then the signals ... then the testing of loco's.
Instead, they employ thousands and thousands of workers, and hundereds of construction companies ... who each in turn, pad the bill, purposely sandbag and cause unnecessary construction delays, and are actually caught sleeping on the job, sitting home clocked in on the timeclock, or embezeling funds.
The cost will be in the Trillions ... for a line that only a couple dozen passengers will ride each day.
And when the passengers get to the end of the line ... their workplace is 25 miles distant the terminus station ... requiring a Rental Car, Taxi, or many many connecting bus and trolley route transfers.