I personally didn't find Legacy train building that hard. I've done it several times.
1) Press the TR button, then enter the ID number for the train you want to create.
2) Press the Info button.
3) Select Build.
4) Type in the ID of the lead locomotive, push the direction button if you want it to go backwards, then push Add.
5) Type the ID of the next locomotive, push the direction button if you want it to go backwards, or the horn button if you want the train horn or bell to sound from this locomotive, or the mic button if you want crew talk to come from this locomotive, then push Add.
6) Repeat step 5 for each locomotive you are adding to the train.
7) If you are adding any of the sound cars or command controllable cranes, enter them by also typing in the ID and then the Add button.
8) When all items have been added to the train, push the Set button, and wait until they all blow their horns, and you are now good to go.
Note for when a locomotive is in more than one train, it'll only respond to the last train it was added to. To run a different train, you simply Press the TR button, enter the ID, press the info button and then the Set button and now you are good to go for that train. I do this mainly to allow my VL Reefer to be run behind more locomotive then just my VL BB.
