Where are the 500/1500 series cars?

Not 100% accurate Sery. There are 1700's in the lead on the OC as well.

Mainly in weekends I get to see 1700s in the Old Colony Lines, On weekdays, it's a rarity, although I did get one in a weekday on the train out of Middleboro.

I saw a solid bi-level set heading north past Savin Hill yesterday around 300pm as I was driving along the SouthEast Expressway, unfortunately traffic was moving at the speed limit and the wall blocked any chance of seeing any numbers.