Nowt wrong with asking the question. But its interesting to read posts where costs after the initial construction cost have been considered.
I've got some more "costs of ownership" to add:
Insurance (against how many risks - conveying passengers?)
Storeage
Finance repayments
Admin (administering the leasing payments, the (crippling) cost of running the office payroll, pensions, rent, rates, heating, telecoms etc. All aiming to manage the leasing and operation of the train)
Marketing (to advertise and promote the stock you have available)
Oh, and did I mention Insurance?
Frankly, I think if the question was to be put in a realistic commercial context, then the actual cost of manufacture becomes irrelevant. If you set up a leasing company (which all the big banks have done) then you can pay for the manufacturing of almost any product, and simply impose terms on the lessor to recoup the cost - mainly
a) to require maintenance & insurance, and
b) monthly payments.
That nicely leaves the lessor to find business for the train and to manage its marketing, management, overheads, maintenenace and operating costs (somone added "uniforms").
And all the time the train is in service - it actually belongs to the leasing company. So we're back to where we are now . . .