So, you are not continuing this train with a new transit, you are in a "tag-team" with another train.
That is, somewhere in the middle or end of Transit A you want to run a different train on Transit B.
If you built transits with a 1:1 correspondence with trainonfo files, you can specify the locomotive in traininfo.
When you "load traininfo B" action in transit A and that traininfo file B specifies locomotive B, then Transit B will run loco B.
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Ken
NYNH&H, Old Colony Division, Cape Cod Branch (1949-1959)
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Ken Heywood