Got a little more done to the sub roadbed and have starting putting in the joint bracing as follows:
The screw is only there until the glue dries properly, probably 24 hours for a good strong bond.
That's the way to do it mate. The only suggestion, don't rely on the glue only, put another 3 in. 1 more an inch in from the end of the brace on the same side as that one and two the other side to match. Never put spliced joints where the transitions are at the bottom or top of a grade, always in the middle, even if it means wasting wood to get it there. Avoid a joint right under a turnout any closer than you have there or under a track join if possible. We have one on the club layout that has created a slight dip between the track and the same end of a turnout, where the track rises at the grade bottom, enough to uncouple engines or cars on occasion.