One train between W and Y. That could only be S, because S has to be somewhere between them in all scenarios.
This new rule is pretty restrictive. Here are the diagrams:
A can’t work, S has to be 3 or 6.
B is no good, because the sixth train is either Q or Y.
C can’t be true. R is in 1 in the first scenario and in the second scenario R has to go before V/T, so it is second at the latest.
D can’t be true because S is either 3 or 5.
E is CORRECT. In the first scenario, R has to go first. In the second scenario, R could be first, in front of V/T and Q.
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