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Let me see if I can remember the positions. Far left was RELEASE; next RUN; then FIRST SERVICE; LAP; SERVICE, and lastly, EMERGENCY. You normally were in Run if the brakes were off. There was a cut-out **** if you didn't want to use First Service.[if cut in, place handle in First Service; when air stops blowing, place in Lap. It would be about 6/8psi reduction.] To make an application, you'd go from Run to service and measure out the reduction you wanted. Then put the handle in Lap. Some early brake stands had a cut-out **** for pressure maintaining, but if cut in, the reduction would stay as on 26L. To release, simply to back to Run. The 24RL had a selector **** for Run. In one spot, Run placed equalizing reservoir air in train line. [yeah, big whup!] But in the other position, Run placed MAIN RESERVOIR air in the train line. Back in the days of AB valves, you could get a quick, clean release with Run. That is, if the hoghead knew what he was doing; and the old heads who learned their trade on steam knew what they were doing! In unskilled hands, Run would overcharge the brakeline and tie up their railroad. On B&O, at least, that selector **** was blanked off in later years...Eq. Res. ONLY. Hope this is of some help, ungern.
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