taking 2nd ave to the glenwood bridge is your next best bet to just walking the tracks... go through the park like you're going to go to the jailtrail, then when you get to the big ugly intersection don't go under the bridge, turn left (not hard left up the hill) follow that all the way to the bridge and cross it. you can then go through west homestead or loop under to the sandcastle parking lot if its open (the overpass you go under right before you get to the sandcastle lot when walking the tracks is the glenwood bridge)
map: http://www.gmap-pedometer.com/?r=3227839