Gidday Rick, [#welcome] to the forum.
While I’m not familiar with the track plan you refer to, here’s is some links to gates, drawbridges etc…
http://cs.trains.com/mrr/f/11/t/217209.aspx?sort=ASC&pi314=2
http://cs.trains.com/mrr/f/88/p/148748/1648532.aspx#1648532
http://cs.trains.com/mrr/f/11/p/208566/2285989.aspx#2285989
http://cs.trains.com/mrr/f/11/p/208566/2285989.aspx#2285989
Hope these are of use.
Cheers, the Bear.