I'm there every Tuesday night after work, sometimes Thursdays. I park at the driving range and start about 5:40 from the parking lot. The 15lb. road bike stays home though. I'm on a 50lb. orange hard tail, fat tires, with fenders, helmet light, bar light, 800 bright lumens, and three red flashing tail lights. Can't miss me. Been there all winter too, through rain, wind and 40* weather. I spend 1 hr on that back hill, where the big locomotives are that I think you're talking about. I do 4 power intervals and 4-5 hill repeats. Sometimes I cut out 2-3 hill repeats and finish off climbing up towards the observatory. I did that last night. If you happen to pass by after my 4 intervals I could join you for a speedy lap, or maybe cruise up towards the observatory, not all the way, but before the downhill starts.
I used to do laps years ago but find I gain much more power from intervals and hill repeats. If anything, just yell out a shout out if you see me at that time.