CNJ I-4 and I-5 Consolidation camelbacks

[e-paw]

The "other" side of the cab was used by the head end brakeman on long freight hauls, It had a means of applying the brakes in case of an emergency. As for communications I can only speak for the CNJ on that one. They used a small whistle that was mounted in each cab to get the attention of the other person, and all cab signals were displayed in both the fireman's and engineers locations. I would assume that other railroads used something similar.