When I was looking at wagon top boxcars on google images, I noticed that wagon tops had over 5 patterns & markings so it will be kind of confusing when it comes down to painting it.
Just look for yourself
We have done a lot of research on the car, and the plan right now is to have a large B&O to the left of the door, and the small capital dome to the right. We will use the version with two concentric circles and the wording LINKING THIRTEEN STATES WITH THE NATION. Did I get that right??
To keep track of repairs, damage, other needs, there is a system applied universally to railroad cars. On freight cars the END with the hand brake is logically the "B" end. The other plain end is the "A" end. Standing at the "B" end and looking at it, to your right is the RIGHT side, and to the left is the LEFT side. This is also used to identify any defect such as 'third wheel on the left side'. It gets a little trickier on cars like cabooses which generally have handbrakes on both end platforms. Then the orientation of the brake cylinder and piston help determine the "B" end.