Alco RS1 No. 1122 pulls ahead to position itself for a switching move after the action of the previous photo, I was testing my new 35mm camera with Kodak Panatomic-X film. This film was slower but less grainy than the more popular Plus-X and Tri-X films, and I continued to use it for most of my non-color rail photography — a happy circumstance that now makes for good high-resolution digital images.