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Train X runs between stations A and D. Similarly, train Y runs between B and D, while Z runs between C and D. E, F, G and H are four intermediate stations/ places enroute X, Y and Z. Find X, Y, Z, A, B, C, D, E, F, G and H given:
1. X, Y and Z run on different days.
2. X and Y share the same route and time slot between E and F.
3....
more...

Upon arriving at F, their routes diverge until H where all three X, Y and Z arrive at the same time.
4. Y and Z share the route and time slot between G and H.
5. Between H and D all three X, Y and Z follow more or less the same route and time slot.
6. All three X, Y and Z are weeklies and belong to three different zones.
7. All three are east west/ west east SF trains travelling 2000+ km.