What are the values of m and I in the diagram below?

Not enough info here to enable us to find a numerical answer.  We don't know how many cars make up the train.

Suppose that c cars make up the train.  

Then the number of seats on this train is 4(c-1) + 2.

Example:  if there are a total of 3 cars, the # of seats is 4(2) + 2, or 10:

4 seats in the first car, 4 seats in the second car, and 2 seats in the third car.