longest commuter train?

The B &M ran what was no doubt the longest RDC commuter trains in the USA of up to 8 cars during rush hours.

Long trains were not the forte of Budd Cars, but the B & M had a fleet of 1/2 powered RDC-9 cars to make these longer trains a bit more fuel efficient.
The RDC-9's were easy to spot as their ends were blind (no cab windows).

Ken

I can remember 6 or so RDCs on Needham trains. And the toxic blue fog they spewed was an environmental nightmare.