ok so here are the recipes that i have worked out:
(note: planks go into slot 1 of the assembly tables, ingots/sticks go into slot 10)
tier 1: made in assembly table 1:
flat car:
3 wood planks, wood cab, 2 wood wheels, 2 wood frame, 2 sticks
passenger car and caboose:
6 wood planks, wood...