I was looking at photos of R-26 cars at http://www.nycsubway.org site and came across of photo of a single R-26 car #7755, followed by a pair of R-12s, and then other cars. Now I know that the R-26's were set up as married pairs (protestant) where the batteries and motor generator were on the even numbered cars, and the air compressor was on the odd numbered cars, hence neither could run without the other. So how was a single R-26 able to operate in this train?
http://www.nycsubway.org/perl/show?22873
Stuart
http://www.nycsubway.org/perl/show?22873
Stuart
The light at the end of the tunnel may be the headlight of an on-coming train.