For a second time, SEPTA’s board authorized the construction of gas and heat cogeneration gas plant next to Roberts Rail Yard and the Midvale Bus Depot in Nicetown on Thursday.

As SEPTA board member and environmental lawyer Robert Fox began to defend SEPTA’s decision to build the small gas plant, the forty or so environmental activists present broke out into a variant of an old union organizing song, “Which side are you on?”

That song was used in the early 20th century as a rallying cry…