In 1923 the ever-frugal Q was planning to increase the water capacity of a number of its O-3 and M-2/M-2-A engines by lengthening their tenders, so it had Baldwin deliver new O-1-A Mikes 4940-4999 with tender underframes long enough to fit the lengthened tenders of the O-3s and M-2 engines. The underframes were then swapped out as the lengthening was completed, which means most of the 4900's ran for at least a short time with the back porch tenders.
The hoses from the bottom of the tender to the journals of the trucks fed water to the bearings to cool them in the event they overheated (fortunately, water and oil don't mix). Each hose could be disconnected and attached to the other journal of the same truck, if needed.
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