Undefined

I have stop name , boarding & alighting columns in my table. Consider the below example. Boarding means passengers getting into the bus & Alighting means passengers get down the bus. From A to B 10-0 = 10 passengers travelled. B to C 10+7-5 = 12 passengers travelled. C to D 12+8-6 = 14 passengers travelled. From D to E 14+5-3=16 passengers travelled.

Logic for B to C is : Previous stop passengers travelled from(A to B) + current stop boarding(B)-current stop alighting(B)

Logic for C to D is : Previous stop passengers travelled from(B to C) + current stop boarding(C)-current stop alighting(C)

The above logic is same for all in between stops (A to B), (B to C), (C to D), (D to E)......etc

Based on this logic pls provide me DAX to calculate no of passengers travelled between each stop (Dynamic DAX) A,B,C,D,E are the stops. stop_name, boarding, alighting

A,10, 0

B ,7, 5

C, 8, 6

D, 5 ,3

E ,0, 16

The output should be like this 

A to B :  10

B to C :  12

C to D :  14

D to E :  16

A to B -9

B to C - 16

C to D - 24

D to E - 26