I think it's just my luck and some planning. This was shot close to where I live.
I guess if you know your area well (like where sun rises and sets) you get a better chance.
The day before I took this shot I notice that sky was awesome near 7pm while I was on the train.
The following day I made it a point not to work overtime and went home to get my gear. I went to an area where I know there was a clearing and where the sun would set. I was hoping the good lighting that I saw the previous day would repeat. Luck was on my side.